There was a time when getting a new mobile deal meant signing up for two years and paying off a handset you didn’t really need. Those days are long gone. If you already own a phone you’re happy with, a SIM-only plan is almost always the smarter, more affordable choice — you simply pop in a new SIM (or activate an eSIM) and pay for the calls, texts and data you actually use. No lengthy contract, no credit check, and no paying a premium every month for a phone you bought outright ages ago.
The best part is the flexibility. A good SIM-only plan runs on a rolling 30-day basis, so you’re never locked in. If your usage changes, you move up or down a plan. If you want to leave, you just don’t renew. Every plan below keeps your existing number, includes 100 international minutes, and comes with EU roaming on most tiers — so whether you’re a light user or someone who streams all day, there’s an allowance that fits. Here’s a closer look at the options worth considering.
What to Look for in a SIM-Only Plan
Choosing the right prepaid SIMÂ is mostly about matching the plan to your real habits rather than guessing. It helps to check your last couple of months of usage first, then weigh up:
- Data — the number that matters most. If you stream, navigate and scroll on mobile data, aim high; if you’re on Wi-Fi at home and work, a smaller allowance goes a long way.
- Calls and texts — most plans here include unlimited UK calls and texts, but lighter plans offer a generous set allowance instead.
- International minutes — every plan includes 100 international minutes, handy if you occasionally call abroad.
- Roaming — check the plan covers the regions you travel to, from EU-wide to India and beyond.
- Flexibility — a rolling 30-day term with no contract means you can adapt whenever life does.
The SIM-Only Plans Worth Considering
Here’s a closer look at the plans on offer. Each runs on a rolling 30-day term and includes 100 international minutes, with unlimited UK calls and texts unless noted.
UK Plan Unlimited
Truly unlimited data with unlimited UK calls and texts, 100 international minutes, and EU and India roaming included. This is the plan for people who never want to think about running out — endless streaming, tethering, video calls and downloads without a second glance at the data counter. Best for heavy users, remote workers and anyone who treats their phone as their main screen.
UK Plan Mega Plus
A hefty 120GB of data with unlimited UK calls and texts, 100 international minutes, and EU and India roaming. It offers nearly all the freedom of unlimited at a slightly leaner level, so it’s ideal for big streamers and gamers who want plenty of headroom but don’t quite need a bottomless allowance. Best for heavy users who like a little structure.
UK Plan Super Extra
75GB of data with unlimited UK calls and texts, 100 international minutes, and EU, China and India data roaming. The wider roaming makes this a strong pick if you travel beyond Europe, and 75GB is more than enough for daily streaming, browsing and maps. Best for regular users who venture further afield.
National Plus
30GB of data with unlimited UK calls and texts and 100 international minutes. This is the comfortable middle ground — enough data for everyday streaming, social media and navigation without paying for allowance you won’t touch. Best for typical users who want a dependable, no-fuss plan.
UK Plan Smart
5GB of data with 1000 UK calls and texts, 100 international minutes, and EU roaming. If you spend most of your day connected to Wi-Fi at home and work, this keeps your costs low while still covering calls, messages and light browsing on the move. Best for light users and second phones.
Quick Tips for Getting the Most From Your Plan
- Base your choice on your busiest month, not your average — it’s more affordable than topping up repeatedly.
- Connect to Wi-Fi at home and work to stretch a smaller data allowance further.
- Because plans are 30-day rolling, review your usage every few months and switch tiers if your habits shift.
- Keep your existing number when you move — there’s no need to tell everyone you’ve changed.
The Bottom Line
A SIM-only plan puts you firmly in control: you choose the data you need, keep your number, and there’s no contract quietly costing you more than it should. Whether you want unlimited everything or a lean plan for light use, the right fit is simply the one that matches how you actually use your phone month to month. Take a look at the latest SIM-only plans and find the allowance that suits you. Short on time but still curious? There are plenty more two-minute guides over at 2minuteread.