How does Telmex's network stability compare to its competitors for high-speed internet?

If by network stability you mean reliability, consistency, and how often the connection successfully stays usable—not just maximum speed—Telmex is competitive but currently trails Totalplay, and generally trails Megacable/izzi on some reliability measures.

The most useful recent evidence is from Opensignal’s April 2026 Mexico Fixed Broadband Experience report, based on measurements from January–March 2026:

OpenSignal Insights### What that means for Telmex

• Totalplay has the clearest lead in stability. Opensignal puts it substantially ahead of Telmex in both Reliability Experience and Consistent Quality.OpenSignal Insights
• Telmex isn't necessarily unreliable. Its 70.1% Consistent Quality score means roughly 7 in 10 measured tests met Opensignal's consistency criteria, but competitors scored higher nationally.OpenSignal Insights
• Telmex's technology matters enormously. Telmex operates both fiber and older DSL infrastructure. If your address has Telmex FTTH, the comparison is much more favorable than if you're being offered copper/DSL. Opensignal explicitly notes Telmex uses a combination of DSL and fiber.OpenSignal Insights
• Independent nPerf data from 2025 also puts behind and Megacable in overall fixed-network performance, although performed particularly well for web browsing and streaming on FTTH.

There's also a useful distinction between technical network measurements and customer-reported problems. An analysis of Mexico's IFT "Soy Usuario" data for Q2 2025 reported complaints per 100,000 subscribers of 3.65 for izzi, 8.33 for Megacable, and 13.41 for Telmex. That's a different metric from Opensignal's reliability score, but it points in the same general direction regarding Telmex having more reported service issues.Expansión

The big caveat: your address can matter more than the brand

For Mexican fixed internet, I'd pay particular attention to which technology Telmex offers at your exact address:

• Telmex fiber (FTTH): much more compelling for a high-speed connection.
• Telmex DSL: I'd expect a greater gap versus fiber competitors, particularly for speed and potentially consistency.
• Totalplay fiber: consistently strong in the nationwide measurements.
• Megacable: performance varies considerably by local network, but its measured latency is particularly strong.
• izzi: likewise depends heavily on whether your address is served by its newer fiber infrastructure versus older cable infrastructure.

So, if you're choosing between Telmex fiber and Totalplay fiber, the current national data favors Totalplay on measured reliability/consistency. If you're choosing Telmex fiber versus a cable/older-network competitor, the answer is less straightforward.

If you tell me your city/colonia and the Telmex and competing plans you're considering, I can compare the actual technologies, speeds, reliability data, and reported outages for those providers in your area.

If by network stability you mean consistent performance, reliability, and resistance to slowdowns—not simply advertised Mbps—recent independent measurements generally put Telmex behind Totalplay and around the middle of the major Mexican ISPs.

• Totalplay: Opensignal’s April 2026 study gave it the strongest Reliability Experience at 599/1000, versus 510 for Megacable, 504 for izzi, and 478 for Telmex. Totalplay also led Consistent Quality at 81.0%, compared with 72.9% for izzi, 72.8% for Megacable, and 70.1% for Telmex.OpenSignal Insights
• Telmex: Its reliability score was therefore below the other three major providers in that particular nationwide measurement. Its performance is also heavily dependent on whether your address has fiber (FTTH) or older copper/DSL infrastructure; Telmex uses both.OpenSignal Insights+1
• Megacable and izzi: Both were ahead of Telmex on Opensignal's 2026 reliability measure, although the underlying technology varies by location (fiber vs. cable).OpenSignal Insights
• Independent 2025 nPerf data similarly put Telmex below Totalplay and Megacable on overall fixed-internet performance, although nPerf is measuring broader performance rather than outages specifically.nPerf

One important wrinkle: complaint data tell a somewhat different story. In the IFT's April–June 2025 report, Telmex had the largest absolute number of telecommunications complaints, but when normalized to subscribers, Totalplay had the highest number of complaints specifically for fixed internet. The IFT explicitly cautions that complaints aren't the same thing as network failures.IFT

What this means in practice

If you are choosing Telmex fiber vs. Totalplay fiber at the same address, the available nationwide evidence points toward Totalplay having more consistent measured performance, while Telmex fiber is still substantially different from old Telmex DSL.

The technology available at your exact address matters enormously. A Telmex FTTH connection can behave very differently from a Telmex copper connection, so I wouldn't judge a specific Telmex installation solely from the national averages.

If you tell me your Mexican city/colonia and whether you're considering Telmex, Totalplay, izzi, or Megacable, I can compare the available technologies, typical speeds, latency, and reliability evidence for that area.

When comparing Telmex’s (Infinitum) high-speed internet network stability to its main competitors in Mexico (Totalplay, Megacable , and izzi ), performance generally depends on whether you are on their legacy copper infrastructure or their modern fiber-optic (FTTH) network.

1. The Technology Transition (Copper vs. Fiber)

• Telmex: While Telmex remains the market share leader, a significant portion of its historical stability issues stemmed from its aging copper (DSL) lines. However, Telmex has aggressively migrated a vast majority of its user base to fiber optics (reaching over 90% fiber penetration). On pure fiber, Telmex's stability is vastly improved compared to the old copper days, offering symmetric upload/download speeds.
• Competitors: Totalplay launched as a pure-fiber (FTTH) provider from day one, giving them an architectural advantage with fewer legacy bottlenecks. Meanwhile, Megacable and izzi have historically relied on hybrid fiber-coaxial (HFC) cable networks, though both have been rapidly upgrading and expanding their own direct-to-home fiber footprints.

2. Stability & Reliability Comparison

• Totalplay: Widely regarded in consumer consensus and crowd-sourced reviews (such as community metrics on Reddit Discussing Mexican ISPs ) as the most consistent frontrunner for high-speed stability and low packet loss. Totalplay's pure-fiber buildout suffers fewer localized drops, though outer-neighborhood infrastructure can vary.reddit.com
• Telmex (Fiber Infinitum): Once upgraded to fiber, Telmex performs reliably for daily usage, gaming, and streaming. However, user feedback often points to higher variance in customer service response times during outages compared to Totalplay, and legacy copper areas still pull down Telmex’s aggregate satisfaction scores.
• izzi and Megacable: Cable-based (HFC) connections from izzi or Megacable tend to suffer more from neighborhood-wide bandwidth congestion during peak evening hours compared to dedicated fiber architectures, impacting latency stability—though their dedicated fiber tiers perform much better.

Summary Verdict

If you have access to Telmex’s modern fiber-optic network , the raw stability is competitive and robust enough for heavy high-speed demands. However, Totalplay still generally edges out the competition and Telmex in terms of pure, uninterrupted uptime consistency and modern hardware deployment due to its native-fiber infrastructure.reddit.com

To give you the most accurate comparison for your situation, could you share:

• Your general city or region in Mexico?
• Whether you are considering Telmex Fiber (Infinitum) or a specific competitor package?

When comparing Telmex (Infinitum) ’s high-speed internet network stability to its primary competitors in Mexico (Totalplay, Megacable , and izzi ), performance largely depends on whether you are served by their modern Fiber-to-the-Home (FTTH) infrastructure or legacy copper/hybrid setups.reddit.com+1

Performance metrics, benchmark testing, and user consensus break down across the major providers as follows:

• Totalplay is widely considered the performance and consistency leader. According to Ookla Speedtest Intelligence data , Totalplay consistently ranks as the fastest fixed ISP in Mexico, scoring higher in throughput, median download/upload speeds, and lower overall latency. Its pure-fiber network yields fewer dropouts compared to mixed or legacy lines, though users occasionally note regional fluctuations.ookla.com+1
• Telmex (Infinitum) has heavily aggressively expanded and upgraded its fiber footprint, becoming an early adopter of symmetrical upload/download speeds on many plans. While its top-tier fiber connections are generally stable, Telmex still services pockets of users on legacy copper (DSL) lines where stability and speeds degrade significantly. In general benchmark scoring, Telmex trails Totalplay and modern fiber implementations of Megacable in raw speed performance scores, but it often scores well for routing consistency in specific interactive tasks like gaming.ookla.com+1
• Megacable has been actively transitioning its Hybrid Fiber-Coaxial (HFC) infrastructure into full FTTH fiber, leading to steady improvements in median upload speeds and closing the gap with top competitors. However, areas still reliant on older cable nodes can experience higher latency and congestion during peak evening hours compared to pure-fiber competitors.ookla.com
• izzi relies heavily on traditional cable (DOCSIS) technology for a large portion of its massive subscriber base, which introduces inherent upload bottlenecks and higher susceptibility to local node congestion compared to pure FTTH options. In national performance rankings, izzi typically scores below Totalplay, Megacable, and Telmex on raw speed and responsiveness metrics.ookla.com+2

If you want to narrow this down for your specific situation, tell me:

• Your city or neighborhood
• Whether you are choosing between pure fiber or hybrid/cable plans
• Your primary use case (gaming, remote work, heavy streaming)

I can give you a more targeted recommendation on which provider performs best in your local area.

If by network stability you mean reliability—fewer interruptions, consistent performance, and maintaining usable speeds—Telmex is competitive, but recent independent measurements generally put Totalplay ahead on consistency/reliability, while izzi has fewer formal complaints per subscriber.

Recent comparison in Mexico

Those Opensignal figures come from measurements collected January–March 2026 across Mexico. Totalplay led both reliability and consistent quality, while Telmex was fourth among the four major providers on those particular metrics.OpenSignal Insights

Telmex does have an important advantage depending on your address: its network is increasingly fiber-based, and fiber-to-the-home Telmex can be considerably more stable than older DSL infrastructure. Opensignal notes that Telmex still uses a mixture of DSL and fiber, whereas Totalplay is fiber-only.OpenSignal Insights

There is also a different way to measure stability: customer complaints. An analysis based on IFT's 2025 Soy Usuario data found approximately 13.41 complaints per 100,000 Telmex subscribers, versus 8.33 for Megacable and 3.65 for izzi. That's not the same thing as measuring outages—complaints depend on customer behavior and support experiences too—but it is another useful signal.Expansión

What this means in practice

• Telmex fiber: potentially a very good choice for stable high-speed service, particularly if your local Telmex fiber infrastructure is good.
• Totalplay fiber: recent nationwide measurements show the strongest combination of reliability, consistency, and speed.
• izzi: can perform well for consistency and has had relatively few formal complaints per subscriber, but its HFC/coaxial infrastructure varies substantially by neighborhood.
• Megacable: also varies considerably by location; its measured reliability is ahead of Telmex nationally.

The address-level difference matters enormously. A Telmex fiber connection on a well-maintained network can be more dependable than a theoretically better-ranked competitor at a particular address.

If you tell me your city/neighborhood and the Telmex speed you're considering (e.g., 350, 500, or 750 Mbps), I can compare the available providers there and focus specifically on reliability rather than just advertised speed.

When evaluating Telmex (Infinitum) against major competitors like Totalplay and Izzi in Mexico's high-speed internet market, network stability largely depends on whether you are connected via their legacy copper infrastructure or upgraded fiber-optics.reddit.com+3

Network performance and stability break down across the major providers as follows:

• Totalplay is widely considered the performance and consistency leader. According to benchmark reports from Opensignal , Totalplay consistently ranks highest in overall fixed broadband experience, capturing top marks for consistent quality, download speeds, and video streaming stability. Because their network was built natively as fiber-to-the-home (FTTH), they suffer from fewer legacy degradation issues.insights.opensignal.com+3
• Telmex (Infinitum) remains the massive market share leader and has aggressively overlaid its old copper lines with fiber-optic infrastructure. Where pure fiber (FTTH) is active, Telmex's stability is robust, highly reliable, and competitive. However, user experiences can vary heavily; legacy pockets still running on older copper/DSL lines suffer from frequent drops, lower upload speeds, and distance-dependent attenuation compared to native fiber competitors.insights.opensignal.com+4
• Izzi (Televisa Cable) relies heavily on a hybrid fiber-coaxial (HFC) cable infrastructure alongside expanding fiber footprints. Consumer and independent metrics generally place Izzi slightly behind Totalplay in raw consistency and peak consistency, with stability fluctuating more during peak evening hours depending on local node congestion in your neighborhood.insights.opensignal.com+1
• Megacable acts as a strong regional player (similar to Izzi's cable-hybrid model), but often scores lower on national consistency benchmarks compared to the pure-fiber rollout of Totalplay or modernized Telmex zones.insights.opensignal.com+1

Summary Verdict

If Telmex has fully deployed modern Infinitum Fiber (FTTH) directly to your specific building or street, its stability is exceptionally solid and price-competitive. However, in head-to-head consistency and peak performance across broader availability metrics, Totalplay maintains an edge as the most stable and uniform high-speed network in Mexico.insights.opensignal.com+4

If you'd like to narrow this down, let me know:

• Your city or neighborhood (as local infrastructure varies drastically block-by-block)
• Whether you need the connection primarily for gaming, remote work, or heavy streaming

I can help you figure out which provider has the best track record in your specific area.

If by network stability you mean how consistently the connection stays usable—rather than simply advertised speed—Telmex is currently solid but not the Mexican market leader.

The most useful apples-to-apples data is Opensignal's April 2026 Mexico fixed-broadband report, based on measurements from January–March 2026:

OpenSignal Insights### What that means

• Totalplay is the clear stability winner. It leads both Reliability Experience and Consistent Quality nationally. Its all-fiber network is an important advantage; Opensignal notes that Totalplay sells fiber packages exclusively, while Telmex still uses a combination of fiber and DSL.OpenSignal Insights+1
• Telmex is competitive with izzi and Megacable on consistency, but it trails all three major competitors on the 2026 reliability metric. Its 70.1% Consistent Quality score is only about 2.7 points below izzi/Megacable, so the difference isn't enormous there.OpenSignal Insights
• Telmex's biggest advantage is upload performance relative to its competitors other than Totalplay. Its measured 37.4 Mbps upload was essentially tied with Megacable and far ahead of , although was substantially faster at 76.2 Mbps.

There's also an interesting difference between technical measurements and complaints. A 2025 IFT-derived comparison reported Telmex at 13.41 complaints per 100,000 subscribers versus 8.33 for Megacable and 3.65 for izzi. That's not a pure outage rate—it includes customer complaints and therefore shouldn't be treated as an exact reliability statistic—but it points in the same general direction.Expansión

My practical ranking

For high-speed internet stability in Mexico, I'd roughly put them:

1. Totalplay → 2. Megacable/izzi → 3. Telmex

But for a particular home, the technology available at the address is more important than the brand ranking. A Telmex FTTH connection can be a very good choice, while Telmex over older copper can be much less attractive.

If you tell me your Mexican city/area and the speeds you're considering (e.g. Telmex 350 Mbps vs Totalplay 300 Mbps), I can compare the providers specifically for that market.

When evaluating Telmex (Infinitum) network stability against its primary competitors in Mexico (Totalplay, Izzi , and Megacable), performance largely depends on whether your connection has been successfully upgraded to fiber optics or is still lingering on legacy infrastructure.

A breakdown of how Telmex's stability compares to its rivals highlights key performance factors:

• Telmex (Infinitum):
  • The Fiber Transition: Telmex has aggressively migrated a vast majority of its user base from old copper DSL lines to fiber optics. Where pure fiber (FTTH) is active, Telmex stability is drastically improved compared to its historical copper reputation, offering solid uptime and symmetrical speeds.
  • The Drawback: Legacy copper infrastructure still exists in pockets or older neighborhoods. If you are on an older copper-hybrid line, stability, latency, and packet loss suffer significantly compared to pure-fiber competitors. Customer service and fault resolution can also be slower and more bureaucratic.
• Totalplay:
  • The Stability Leader: Widely regarded by consumer consensus (Reddit Reviews on Mexican ISPs ) and performance trackers as a top-tier performer for pure-fiber consistency. Because Totalplay built out a 100% native fiber-to-the-home network from its inception, it generally suffers fewer drops, lower jitter, and better latency under heavy loads than Telmex.reddit.com+1
• Izzi:
  • The Hybrid Competitor: Izzi relies heavily on a Hybrid Fiber-Coaxial (HFC) cable network alongside its expanding direct fiber footprint. While Izzi’s download speeds are competitive, cable infrastructure inherently introduces more upload bottlenecks and susceptibility to local node congestion during peak evening hours compared to Telmex's or Totalplay's direct fiber connections.monitoring.nodes.pabau.com
• Megacable:
  • The Regional Rival: Similar to Izzi, Megacable has been aggressively upgrading its traditional cable network to fiber, but consistency varies heavily by region. Users in urban hubs report decent stability, but rural or secondary expansion zones often face frequent micro-outages during bad weather or high-traffic periods.

To give you the most accurate comparison for your situation, let me know:

• What city or neighborhood are you looking to connect in?
• Is pure fiber (FTTH) available at your specific address, or are you looking at copper/hybrid options?