O2 SIM-only deals
O2 SIM-only deals
8 O2 plans, cheapest first. Prices checked against O2's own site — these are the ongoing monthly costs, not introductory rates.
| Data | Contract | Monthly price | |
|---|---|---|---|
| 10GB | 30-day rolling | £10.00 | Get deal |
| 30GB | 30-day rolling | £15.00 | Get deal |
| 3GB | 24-month contract | £18.00 | Get deal |
| 100GB | 24-month contract | £20.00 | Get deal |
| 50GB | 30-day rolling | £20.00 | Get deal |
| 20GB | 24-month contract | £21.00 | Get deal |
| 3GB | 12-month contract | £21.00 | Get deal |
| Unlimited | 24-month contract | £22.00 | Get deal |
Cheapest O2 plan is £10.00/mo. O2 runs on O2's network — compare it against every other provider using the same masts.
What you get with O2
The extras and perks included with a O2 plan, beyond the data and minutes.
O2 Priority
Early access to gig and event tickets plus weekly giveaways and offers. Open to O2 and Virgin Media customers.
Details on O2's site →O2 Volt
If you also have Virgin Media broadband, Volt doubles your data at no extra cost.
Details on O2's site →The essentials
| Price rises | Yes Prices rise every April - O2 publishes the increases on each plan (e.g. Unlimited Mini £22 becomes £24.50 from the April 2027 bill and £27 from April 2028). The airtime plan rises by £2.50 a year. |
|---|---|
| Data rollover | Some plans Only on Pay Monthly Plus and Ultimate plans (not standard plans; Unlimited excluded). Unused data rolls into the next month. |
| Full-speed data | Full speed Full access, no speed caps |
| 5G | ✓ |
| eSIM | ✓ |
| Tube coverage | ✓ You get Tube coverage through O2’s network. TfL station WiFi has been superseded by 4G/5G mobile coverage in tunnels and stations, rolled out by all four networks and growing across the lines — just use your phone and it connects automatically. |
| Inclusive international calls | Some plans Pay As You Go plans include a discounted international-calling allowance; Pay Monthly is charged per minute. |
| Unlimited data | Unlimited Unlimited — subject to O2's fair-usage / traffic-management policy (no set GB cap). |
| EU roaming | Included Inclusive EU roaming |
| Roaming data | 25GB If your UK allowance is over 25GB, a 25GB roaming limit applies in the Europe Zone. |
Technical details
| Roaming countries | ? |
|---|---|
| Tethering / hotspot | ? |
| 5G Standalone | ✓ |
| WiFi calling | ✓ |
| Roaming beyond the EU | Inclusive on Plus Plans, d… |
| 4G calling (VoLTE) | ✓ |
| RCS messaging | ✓ |
| RCS encryption | ✗ |
| Conference calling | ✓ |
| Missed call alerts | ✓ |
| Visual voicemail | ✓ |
| HD Voice | ✓ |
| Carrier IMS | ✓ |
| Carrier voicemail | ✓ |
| Inclusive MMS | Some ULTIMATE ONLY |
| IPv6 | Some IPv4 only |
| Roaming agreements | ✓ Main networks create the direct agreements which are then shared to MVNOs |
| 5G roaming | ✓ |
| 4G calling abroad | ✓ |
O2 FAQ
How much is O2?
The cheapest O2 SIM-only plan is £10.00/mo (10GB, 30-day rolling). O2 sells 8 plans in total, and we check every price against O2's own site.
What network does O2 use?
O2 is a main UK network — it owns and runs its own masts and coverage.
Can I use O2 abroad in the EU?
O2 includes EU roaming. Inclusive EU roaming
Does O2 have 5G?
Yes — O2 includes 5G.
Does O2 support eSIM?
Yes — O2 supports eSIM.
Does O2 raise prices mid-contract?
O2 does not raise prices mid-contract. Prices rise every April - O2 publishes the increases on each plan (e.g. Unlimited Mini £22 becomes £24.50 from the April 2027 bill and £27 from April 2028). The airtime plan rises by £2.50 a year.
Other SIMs on the O2 network
Same masts, same coverage — different prices and features.
Feature and price data is checked by Scrimpr against O2's own site and public documentation. Networks change plans often — always confirm details on the provider's site before buying. Some links are affiliate links (marked *), which support Scrimpr at no cost to you.
