NuFibre has officially launched NUSIM, its new mobile service, taking the broadband provider into the UK SIM market with an eSIM-first proposition built around one very simple headline: unlimited connectivity for £15 a month.

The launch is more interesting than another low-cost SIM offer appearing in an already crowded market. For NuFibre, it is the first visible step towards becoming a broader connectivity provider rather than a company associated only with fixed broadband.

NUSIM is available to both existing NuFibre customers and people who do not use NuFibre broadband, with ordering available through the company’s website and its nuHub customer portal.

One account, more services

For existing customers, NuFibre has tried to make the crossover from broadband to mobile fairly painless. During the NUSIM ordering process, customers receive a verification code that links the new mobile service to their existing NuFibre account.

Once activated, each NUSIM appears inside nuHub alongside the customer’s other services and properties. Individual services can still be managed separately, but billing remains under one account.

That sounds like a small convenience, but it points to the larger strategy. Broadband providers increasingly want a greater share of the household connectivity relationship. Fixed internet, mobile, Wi-Fi and related digital services are gradually becoming parts of the same customer experience rather than completely separate purchases.

NUSIM also allows customers to add multiple eSIMs to the same account, which makes the proposition relevant for families, second devices and people managing several mobile connections.

Unlimited for £15

The launch plan starts at £15 per month on a 24-month contract and includes unlimited UK data, standard UK calls and texts, plus 20GB of roaming data in EU countries. NuFibre says the service runs across the combined Vodafone and Three network and advertises 99.8% UK coverage. Fair-use and service terms apply.

NuFibre says nuSim has no speed cap, but ‘unlimited’ still comes with a fair-use condition. What is missing at launch is the number: NuFibre does not currently state how much monthly usage triggers its fair-use policy or what happens once that threshold is reached.

Activation is completely digital. There is no physical SIM to wait for: after the order and payment are confirmed, the customer receives an eSIM QR code inside nuHub, scans it with a compatible handset and activates the service.

For customers already comfortable with eSIM, that is exactly how mobile sign-up should work in 2026. The trade-off is obvious too: NUSIM is currently for eSIM-compatible phones only. Anyone using an older handset, or anyone who simply prefers a removable physical SIM, is outside the target market for now.

The network timing is also notable. VodafoneThree completed a major network-sharing upgrade in May 2026, saying 28.6 million Vodafone and Three customers could automatically benefit from the best available coverage across the combined footprint, while 16,500 km² of previous mobile “not spots” had been removed. The company is investing £11 billion in its UK network and is targeting 99% 5G Standalone population coverage by 2030.

A competitive price, with a catch

At £15, NUSIM lands at the aggressive end of the UK unlimited market, although it is not alone there. iD Mobile currently offers unlimited data for £15 on a 24-month contract, while SMARTY lists unlimited data at £20 on a rolling monthly plan. VOXI’s fully unlimited plan is currently £35 per month on a 30-day subscription.

That makes contract structure almost as important as headline price. NUSIM is attractive for someone happy to commit for two years, particularly if they already use NuFibre and value having services managed together. A customer who prioritises flexibility may decide that paying a little more for a rolling monthly alternative is worth it.

Roaming is another point worth checking against personal usage. NUSIM includes 20GB in EU countries, while iD Mobile, for example, currently includes roaming in 50 destinations with a 30GB fair-use limit. Frequent travellers may therefore want to compare destination coverage rather than focusing only on unlimited UK data.

Why the launch matters

The interesting part of NUSIM is not that NuFibre has invented a new type of mobile plan. It has not. The significance is that fixed broadband brands increasingly have the technology and wholesale access to move into mobile without becoming traditional network operators themselves.

For NuFibre, mobile adds another recurring service, another reason for customers to stay within nuHub, and another opportunity to build a broader household connectivity relationship. For consumers, the upside is simpler management — provided the price and network experience remain competitive.

Conclusion

NUSIM enters a UK market where £15 unlimited data is no longer extraordinary, so price alone will not create much long-term differentiation. iD Mobile can match the headline, SMARTY offers more contractual flexibility, and larger mobile brands bring deeper retail and handset ecosystems.

NuFibre’s more defensible advantage could be convergence: broadband and mobile managed through one customer layer, with eSIM removing much of the friction involved in adding another service.

The next step should be to deepen that proposition. Shorter contract options, broader device support and a clearer explanation of fair-use conditions would make NUSIM easier to compare on more than price.

For now, though, the launch is a sensible expansion. NuFibre is not trying to out-invent the mobile market. It is trying to own more of the customer’s connectivity stack — and that is exactly where fixed and mobile markets are heading.