MoneySavingExpert Founder, Martin Lewis · Editor-in-Chief, Marcus Herbert Chair, Martin Lewis · Editor, Marcus Herbert

Cheap O2 Sim cards

Here are the cheapest O2 Sim deals. All deals are for new customers of O2. Existing customer? Call your provider to see if it'll offer you it (see haggling help).

Sim card

Is O2 a good network?

O2 is one of the four main networks in the UK and in our most recent customer service poll, O2 scored 5.8/10 based on 559 votes.

Does O2 offer Sim plans for bad credit?

O2 offers a basic PAYG Sim which doesn't require a credit check. But it no longer offers 'traditional' PAYG (where a customer tops up using credit and uses that for calls, texts and data). Instead, it offers data bundles, which start from £10/month.

The cheapest O2 Sim

The cheapest O2 Sim costs £6/month and it currently offers unlimited minutes & texts and 4GB/month data over a 12-month contract. See cheap O2 Sims.

Can I keep my mobile number if I switch to an O2 Sim-only deal?

Yes, you can keep your old mobile phone number. If you're moving from another network, you'll need to text 'PAC' for free to 65075 to request your PAC (porting authorisation code). You will need to provide this to O2 which should move your number over within one working day.

If you are already an O2 customer, you'll need to fill in a 'keep my number' form on its website.

Can I use my O2 Sim abroad?

O2 allows you to use your allowance in the EU without extra charges. However, if your plan comes with more than 25GB of data, you'll only be able to use up to 25GB of data within the EU, which is more than enough for most. For more info, see Cheap Roaming.

Can I get 5G enabled O2 Sims?

Yes, O2 offers 5G on all its Sims. However, be aware you'll need a 5G-compatible phone too.