O2 SIM only deals: comparing their best monthly plans in September
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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: 15th September 2021.
O2's best SIM only deals
The best overall O2 SIM only deal this month
We think O2's best value option on SIM only this September is their £20 a month plan below, which comes with 120GB data, plus unlimited minutes and texts on a 24‑month deal:
Unlimited minutes + Unlimited texts + 120GB data (5G) = £20 a month (24‑month contract)
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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:
O2's 60GB for £18 plan is a good option too
For less monthly data, the next best SIM only plan on O2 in our opinion is their 24‑month one below. For £18 a month, you get 60GB data, plus unlimited minutes and texts:
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:
Unlimited minutes + Unlimited texts + 100GB data (5G) = £16 a month (12‑month contract)
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Unlimited minutes + Unlimited texts + 100GB data (5G) = £15 a month (12‑month contract)
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Unlimited minutes + Unlimited texts + 100GB data (5G) = £15 a month (24‑month contract)
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Their £16 for 25GB plan is a decent deal for September
If you need less data, another good deal on O2 at the moment is their £16 SIM only plan here, which includes 25GB data instead, plus unlimited minutes and texts:
It's a good enough deal to get into O2's best SIMs but you can actually get a lower price for a similar plan elsewhere, even if you definitely want it to use the O2 network. See where you can get it for less here:
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How O2's deals compare with other networks
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