SMARTY is a new SIM-only mobile network that’s built to be simple and honest. We take your unused data each month and turn it into a discount on your next bill.

Primary Region

United Kingdom


Attribution Period (Cookie Length)

30 Days


Smarty Affiliate Programme

SMARTY is a SIM-only network that's built to be simple and honest.

Pay for the data you use, not the data you don't.

Taking data rollover to a new level, we give a discount for any unused data off your next month. We calculate in MB's, not GB's, meaning you get exactly what's due.

Don’t want to be tied in?

Cancel anytime or change plans monthly. No minimum contract, no credit checks and no surprises at the end of the month. Pay in advance and enjoy the flexibility.

Add-ons that are 100% transparent

If you run out of data an add-on will cost you £1 per GB - the same as it costs in your plan. Our add-ons never expire so long as you have a live plan.

Unlimited UK standard calls and texts - on all plans

Call your friends and family as much as you want. No catch.

How does the discount work?

£5 of any plan covers the costs of providing unlimited standard calls and texts and running the network. The rest is for data. At the end of each month we’ll take the value of the data you haven’t used, and provide you with a discount on your next plan, at a rate of £1 per GB. So, if you’ve got 3GB of unused data left at the end of a month we’ll give you £3 off when you get your next plan. And what’s more we calculate using remaining MBs, not GBs, meaning the discount you get is exactly what’s due.


1GB - £6

2GB - £7

3GB - £8

4GB - £9

10GB - £9

30GB - £10

50GB - £15

UnlimitedGB - £15