giffgaff SIM-only deals
giffgaff SIM-only deals
8 giffgaff plans, cheapest first. Prices checked against giffgaff's own site — these are the ongoing monthly costs, not introductory rates.
| Data | Contract | Monthly price | |
|---|---|---|---|
| 2GB | 30-day rolling | £6.00 | Get deal* |
| 6GB | 18-month contract | £8.00 | Get deal* |
| 5GB | 30-day rolling | £8.00 | Get deal* |
| 25GB | 18-month contract | £10.00 | Get deal* |
| 20GB | 30-day rolling | £10.00 | Get deal* |
| 50GB | 18-month contract | £12.00 | Get deal* |
| 26GB | 30-day rolling | £12.00 | Get deal* |
| Unlimited | 18-month contract | £14.00 | Get deal* |
Cheapest giffgaff plan is £6.00/mo. giffgaff runs on O2's network — compare it against every other provider using the same masts.
The essentials
| Price rises | None Contractually guarantees no mid-contract price rises on its 18-month SIM-only plans (sign-ups before the end of 2026). 30-day rolling plans carry no guarantee, but you can leave any time. |
|---|---|
| Data rollover | No No data rollover — unused data is lost at the end of the month. |
| Full-speed data | Some caps Bottom Priority |
| 5G | ✓ Plans include 5G speeds at no extra cost on the O2 network. |
| 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 TfL station WiFi has been superseded by 4G/5G mobile coverage in tunnels and stations, rolled out by all four networks and growing across the lines — just use your phone and it connects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 | No International calls are charged per minute or via a paid add-on — not included in the plan. |
| Unlimited data | 650GB 650GB fair-use cap — giffgaff may apply traffic management or move you to a business plan above ~650GB/month (per its Fair Usage Policy). |
| EU roaming | Included You can use up to 5GB of your allowance in the EU at no extra cost. |
| Roaming data | 5GB A maximum of 5GB of your plan data is included when roaming in the EU. |
Technical details
| Roaming countries | EU (37) Roam free in 37 EU-zone countries using up to 5GB of your allowance; further countries only via paid travel add-ons. |
|---|---|
| Tethering / hotspot | ✓ Tethering is allowed on all plans. |
| 5G Standalone | ? |
| WiFi calling | ✓ |
| Roaming beyond the EU | Charged per use; rates dep… |
| 4G calling (VoLTE) | ✓ |
| RCS messaging | ✓ |
| RCS encryption | ✗ |
| Conference calling | ✓ |
| Missed call alerts | ✗ |
| Visual voicemail | ✗ |
| HD Voice | ✓ |
| Carrier IMS | ✓ |
| Carrier voicemail | ✓ |
| Inclusive MMS | ✗ |
| IPv6 | Some IPv4 only |
| Roaming agreements | ✓ DIRECT |
| 5G roaming | ✓ |
| 4G calling abroad | ✓ |
giffgaff FAQ
How much is giffgaff?
The cheapest giffgaff SIM-only plan is £6.00/mo (2GB, 30-day rolling). giffgaff sells 8 plans in total, and we check every price against giffgaff's own site.
What network does giffgaff use?
giffgaff is an MVNO: it runs on O2's masts, so you get the same signal and coverage as O2, usually at a lower price.
Can I use giffgaff abroad in the EU?
giffgaff includes EU roaming. You can use up to 5GB of your allowance in the EU at no extra cost.
Does giffgaff have 5G?
Yes — giffgaff includes 5G. Plans include 5G speeds at no extra cost on the O2 network.
Does giffgaff support eSIM?
Yes — giffgaff supports eSIM.
Does giffgaff put prices up mid-contract?
Yes — giffgaff raises prices during your contract. Contractually guarantees no mid-contract price rises on its 18-month SIM-only plans (sign-ups before the end of 2026). 30-day rolling plans carry no guarantee, but you can leave any time.
Other SIMs on the O2 network
Same masts, same coverage — different prices and features.
Feature and price data is checked by Scrimpr against giffgaff'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.
