200GB SIM-only deals: big data for less than unlimited
Plans with 150GB to 310GB, ranked by true monthly cost and checked against the cheapest unlimited plans. By The SimSift team.
Sift's picks
Cheapest 200GB+
Mozillion 210GB, 24-month contract
£15 a month. True monthly cost £15. £0.07 per GB.
Get dealAdMost data for the money
Mozillion 310GB, 24-month contract
£19 a month. True monthly cost £19. The biggest capped plan we found, at £0.06 per GB.
Get dealAd200GB+ with no contract
Mozillion 210GB, 30-day rolling
£16 a month. True monthly cost £16. 30-day rolling, so you can leave any month.
Get dealAdCheapest 150GB+
Talkmobile on Vodafone 150GB, 12-month contract
£5.97 a month for 3 months, then £11.95. True monthly cost £10.46. Intro price for the first months, then the full price; the true cost spreads both over the contract.
Get dealAdEvery 150GB+ plan we checked
Cheapest true monthly cost first. None of these plans has a price rise written into the contract; if one did, it would be in the true cost.
| Plan | Price | True monthly cost | £/GB | |
|---|---|---|---|---|
| Talkmobile on Vodafone · 150GB · 12-month contract | £5.97 a month for 3 months, then £11.95 | £10.46 | £0.07 | Get dealAd |
| Talkmobile on Vodafone · 150GB · 30-day rolling | £11.95 a month | £11.95 | £0.08 | Get dealAd |
| Mozillion · 150GB · 24-month contract · eSIM · 5G | £14 a month | £14 | £0.09 | Get dealAd |
| Mozillion · 150GB · 12-month contract · eSIM · 5G | £14.50 a month | £14.50 | £0.10 | Get dealAd |
| Mozillion · 150GB · 30-day rolling · eSIM · 5G | £15 a month | £15 | £0.10 | Get dealAd |
| Smarty on Three · 150GB · 30-day rolling · eSIM · 5G | £15 a month | £15 | £0.10 | See plan |
| Mozillion · 210GB · 24-month contract · eSIM · 5G | £15 a month | £15 | £0.07 | Get dealAd |
| Mozillion · 210GB · 12-month contract · eSIM · 5G | £15.50 a month | £15.50 | £0.07 | Get dealAd |
| Mozillion · 210GB · 30-day rolling · eSIM · 5G | £16 a month | £16 | £0.08 | Get dealAd |
| Smarty on Three · 200GB · 30-day rolling · eSIM · 5G | £17 a month | £17 | £0.09 | See plan |
Or go unlimited?
The cheapest unlimited plans we checked, for comparison:
| Plan | Price | True monthly cost | £/GB | |
|---|---|---|---|---|
| Smarty on Three · Unlimited · 30-day rolling · eSIM · 5G | £20 a month | £20 | – | See plan |
| Sky Mobile · Unlimited · 30-day rolling · eSIM · 5G | £22 a month for 12 months, then £28 | £22 | – | Get dealAd |
| Mozillion · Unlimited · 24-month contract · eSIM · 5G | £22 a month | £22 | – | Get dealAd |
| Mozillion · Unlimited · 12-month contract · eSIM · 5G | £22.50 a month | £22.50 | – | Get dealAd |
Sky Mobile: Sky says data plan prices may increase, including during the minimum term, without stating a fixed amount, so our true cost can't include any future rise.
Questions people ask
What is the cheapest 200GB SIM-only deal?
Mozillion 210GB on a 24-month contract at £15 a month true cost, the lowest of the 10 plans with 200GB or more that we checked (11 November 2026).
Is 200GB cheaper than unlimited data?
Today, yes. The cheapest 200GB+ plan is £15 a month and the cheapest unlimited plan is £20 (Smarty, 30-day rolling). The biggest capped plan we found, Mozillion 310GB, is £19.
Is there a 200GB plan with no contract?
Yes. Mozillion 210GB is £16 a month on a 30-day rolling plan.
What happens if I go over my data?
Each network handles it differently: some stop your data, some sell add-ons. Check the network's terms before you pick a capped plan over unlimited.
Ranked by true monthly cost: everything you pay over the contract, including intro prices ending and any price rise written into the contract, divided by the months (30-day plans are costed over 12 months). Links marked Ad are affiliate links, so SimSift may earn commission at no cost to you. It never changes the order, and plans from networks that pay us nothing are ranked the same way. How we make money · How we rank.