The Best SIM Only Deals in September (2023)

All the UK's best SIM Only deals compared in one place

We’ve done the hard work for you and rounded up the best SIM Only deals in the UK for this month across all networks and retailers. 

Switching to a SIM only deal is a simple and fast way to reduce your monthly phone bill when you reach the end of your mobile contract, or if you’ve bought a SIM free phone without a contract.

If you’re happy with your current phone, you can switch your plan to a SIM only plan either with your current network or choose a new one.

Here are the very best SIM Only deals out there this month.

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45p a month bargain SIM

Lyca Mobile | 1GB Data | 250 minutes & unlimited texts | 1 month | 45p a month

Yes you read that right, 45p a month.  With 1GB of data, 250 minutes and unlimited texts, this deal is a steal. The 45p promotion applies for the first 3 months, after which you can cancel or continue at £3.99 a month. If you need a bit more data, they also have a 5GB plan with unlimited calls for £1.39 a month.
Grab this deal from Lyca mobile

6GB for £5.99 a month | 1 month plan

Lebara | 6GB Data | Unlimited minutes & texts | 1 month | £5.99 a month

Lebara SIM plans are so much better than they used to be, with increased data allowances that bring them up to the level of some of the bigger networks. £5.99 bags you 6GB of data plus unlimited calls and texts. You also get 100 international minutes to over 40 countries.
Grab this deal from Lebara

20GB for £7 a month | 1 month plan

iD Mobile | 20GB Data | Unlimited minutes & texts | 1 month | £7 a month

Another great value deal from iD Mobile, so much so that they’ve been awarded a Which? Great Value endorsement.  £7 a month gets you a huge 20GB of data on a rolling 1 month contract. Including EU data roaming too.
Grab this deal from iD