WhistleOut Awards 2026: Best SIM-Only Provider, Large Plans

To qualify for this award, a SIM only plan must run with no lock-in contract and carry 30GB or more of data, built for customers whose monthly usage regularly outpaces a standard allowance. Cost efficiency here is assessed on a per gigabyte basis rather than sticker price, since heavy users feel the effect of running short on data far more than an occasional user would. Inclusions are checked against a checklist of eleven possible features, each worth one point: no speed cap, 5G network access, some international calls, unlimited international calls, roaming inclusion, no excess data charge, data banking or rollover, data sharing, data gifting, streaming or subscription perks, and other bonus perks, with data banking, data sharing, data gifting and unlimited international calls mattering most in practice for a heavy user chasing flexibility from a larger allowance. Network performance is judged using independently measured, provider level speed data, reflecting the continuous demand heavy users place on their connection. Support Channels totals eight specific options: a physical store, phone support, online live chat, email or message support, a responsive social media or forum presence, 24/7 support availability, weekend support, and online account management, one point per channel offered. Product Review draws on satisfaction ratings and reviews left by verified customers of the plan and its provider. Combining all five results produces the plan's overall Ranking. See here for more on our overarching methodology