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O2 SIM only deals: comparing their best monthly plans in January

O2 logo with a SIM card

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We look at whether O2's current best SIM only plans are decent value compared to all their competitor mobile networks in the UK. SIM Sherpa is your trusty guide. Last updated: 4th January 2021.

O2's best SIM only deals

This month's overall best O2 SIM only deal

O2 SIM card
 
100GB data
£20
a month

18-month dealGet this deal

at o2.co.uk
(opens in new window)

We'd say the best SIM only plan O2 are selling this January is their 18‑month 100GB deal below, which comes in at £20 a month and includes unlimited minutes and texts too:

It's not actually the cheapest SIM only deal on the market at the moment with 100GB data or more but it is the lowest-priced plan on any provider using the O2 network. Here are other networks you can beat it on:

O2's £15 for 25GB is our next best choice now

O2 SIM card
 
25GB data
£15
a month

18-month dealGet this deal

at o2.co.uk
(opens in new window)

For people who don't need that much data, O2 are also offering this £15 SIM, which includes 25GB data, unlimited minutes and texts on a 18‑month plan. It's another of their best deals:

Even though it's in our pick of O2's best SIM only deals, you can actually beat it on price with other providers, including ones that also use the O2 network. See the networks with cheaper plans here:

Their £12 SIM with 12GB is our next favourite this January

O2 SIM card
 
12GB data
£12
a month

18-month dealGet this deal

at o2.co.uk
(opens in new window)

If that'd be too much data for you, you might like the £12 SIM only deal running on O2 at the moment. It's a 18‑month plan, which comes with 12GB data, unlimited minutes and texts too:

While this is a good enough deal to make it into the best of O2's SIMs, you can beat it for price (even if you definitely want a provider that uses the O2 network). Here's which other networks can beat it:

Other O2 guides