Why mobile networks are introducing speed caps (and does it really matter?)

Three has dropped surprise speed caps on its customers, limiting its standard consumer plans to 100Mbps. Is speed now a premium feature for mobile data plans?

Recently, I suggested that telcos should focus on providing customers with ubiquitous coverage rather than faster connections, and to “design services around outcomes rather than raw speed.”

Three has taken this advice to the extreme when, two weeks ago, it informed customers that its phone, SIM-only, and mobile broadband plans would be subject to speed caps.

Customers taking out new contracts will be restricted to 100Mbps, but can buy faster speeds at extra cost, while those on pay-as-you-go plans will be limited to 25Mbps. 5G Home broadband plans, with average speeds of 150Mbps, won’t be affected. These changes don’t apply to Three’s MVNOs, such as iD Mobile.

The speed limit is part of the terms agreed at the point of sale, and caps are applied only to new customers, and to those upgrading or renewing their contracts. For now, the speed caps will affect only a minority of Three’s roughly 11 million users, but within just a few years, it’s likely to become the default experience as millions of users will inevitably re-contract or upgrade.

Does it matter?

For many users, the answer is: not very much.

For years, unlimited data plans carried an implicit promise of unrestricted usage, and access to the full, unbridled power of the network. That assumption is now being increasingly questioned.

In practice, the average user’s day-to-day activities will most likely fall comfortably within imposed limits. On paper, it’s a modest change. 100Mbps is still fast, and won’t be a limit that most users notice, not least because mobile broadband performance is highly variable. In fact, if network congestion is better managed, some users may even benefit from a more stable experience.

This also means Three can limit theoretical maximum performance without significantly affecting how the service feels for the majority of its customer base. While 100Mbps is sufficient for most everyday use, it falls well short of the full performance potential of 5G, which delivers median speeds exceeding 200Mbps.

Those using mobile broadband as their home connection may notice the loss of higher peak speeds, and power users downloading large files, running cloud backups, or supporting multiple devices may feel more acutely constrained.

Speed is a key component of perceived service quality, according to a study from Brunel University, alongside coverage and customer service. If operators introduce caps that reduce perceived performance, especially for users who previously experienced higher speeds, there is a risk of undermining satisfaction, even if the service remains technically adequate.

Crucially, this research finds that better speed reduces switching intention, while poor performance increases dissatisfaction and the likelihood of churn. While speed caps may help operators manage networks, they also risk weakening one of the strongest drivers of customer retention.

This creates a tension: while most users may not notice capped speeds in day-to-day use, perceived performance still plays a critical role in satisfaction and retention.

It would be a mistake to see Three’s decision as an outlier. Other UK operators have already experimented with speed tiers and prioritisation as explicit parts of consumer propositions. Once customers are accustomed to the idea that speed can vary by plan, it becomes easier for operators to refine and expand these models over time – but equally, no-one likes to pay for something they once got for free.

Why introduce speed caps?

There are practical reasons behind this move. Mobile networks are shared environments and, as 5G adoption grows, managing demand becomes more complex. Without a degree of control, a small number of power users risk eating up a disproportionate amount of capacity. Predictable limits mean operators can rein in usage and deliver a more consistent experience to the majority.

At the same time, there is a clear commercial logic; for years, operators competed by offering “unlimited” data bundled with the best speeds their networks could deliver.

Three had, until recently, built its reputation on uncapped speeds across its plans. This was backed up by independent testing; Ookla dubbed it the UK’s fastest 5G network, with median download speeds of 293Mbps.

For many users, the 100Mbps speed cap is enough to feel almost unlimited, particularly when combined with flexible terms and low pricing to draw users in and keep the proposition competitive, while the cap ensures that peak demand is controlled and remains predictable.

Now, speed is positioned as a premium feature, with the option to pay more for higher throughput. This is an approach that Vodafone, which will take ownership of Three after buying out CK Hutchison, has wholeheartedly embraced, reflecting a strategy that separates unlimited data from maximum performance. And of course, with fewer players in the market, there’s less pressure to compete purely on price.

Three could also be seeking to close a loophole that allows customers to get cheap home broadband using a 30-day rolling 5G SIM. From a customer point of view, this is a no-brainer; you get flexibility, no long contracts and annual price rises, and, in areas with strong 5G, speeds that rival or even exceed fixed-line connections.

But from the operator’s perspective, it’s a commercial and technical headache.

Operators want to differentiate between mobile usage and Fixed Wireless Access (FWA) for home broadband, even though both are delivered over the same 5G infrastructure. If customers can achieve the same experience using a cheap, rolling SIM, that distinction collapses.

Speed caps reduce both the strain on the network, and the incentive for heavy users to rely on a low-cost SIM as their broadband connection. Mobile networks are built and optimised around variable usage, not sustained, high-volume usage spread across multiple devices. A single home using 5G as its broadband connection can consume considerably more data than an individual smartphone user.

What also cannot be ignored is that all this is taking place against a backdrop of rising energy costs for the industry, and little respite in the near future. The UK’s Big Four telcos suffered a major blow after being excluded from the British Industrial Competitiveness Scheme (BICS), a government initiative providing energy support for businesses who “meet a certain threshold of electricity intensity.”

Consequently, telcos are reportedly drafting emergency plans to manage their soaring energy bills, which could include:

• Rationing voice calls and mobile data
• Slowing internet speeds during peak times
• Introducing surge pricing

Ultimately, this is as much a pricing strategy as it is a network management tool.

Implications for BSS/OSS

Speed caps open up a new commercial opportunity. In a world where “unlimited data” has become the norm, it’s difficult to charge more based on usage alone. By separating speed from access, Three can introduce a new pricing dimension: offering higher performance as a paid upgrade, opening up increased revenues from heavier users (well, those who don’t mind the additional costs) without raising prices for everyone else.

With mobile speed caps, operators are effectively charging for experience rather than consumption. That requires billing systems and product catalogues that can support speed as a controllable, chargeable attribute, rather than treating value purely as a function of data allowance or usage volume.

Performance tiers like maximum speed, priority and quality of service require consistent charging logic and seamless policy enforcement across the network. Because speed limits must be enforced in real-time, this creates a tighter dependency between BSS, policy control and the OSS domain.

Customers might receive prompts when they approach the limits of their current tier or be offered temporary upgrades based on behaviour. Supporting that kind of interaction requires more responsive CRM, capable of handling frequent changes and triggering immediate updates across the stack.

What comes next?

Speed caps are unlikely to be the endpoint, but the next stage of connectivity’s transformation from a single, uniform product, into a set of configurable attributes.

Three is betting that customers care more about reliable, good-enough performance at a competitive price than they do about maximum possible speeds. If that assumption holds, the company gains better control over its network and new ways to monetise it; if it doesn’t, there’s a risk that users could begin looking elsewhere.

Future developments may include greater use of prioritisation, more personalised service tiers, and deeper integration between applications and network performance.

Mobile broadband speed caps may not disrupt everyday usage, but they do reflect a broader shift towards monetising performance rather than simply providing access.

If you’re exploring how to monetise speed, quality of service, or other performance attributes, Cerillion’s catalogue and charging capabilities are designed to support exactly this kind of shift – feel free to get in touch to discuss further.