Network vs network
Asda Mobile vs giffgaff
Different masts, different deals. We compare price rises in pounds, roaming, credit checks and today’s cheapest SIMs on both.
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Do they use the same masts?
No. Asda Mobile uses Vodafone’s masts and giffgaff uses O2’s masts. Check coverage at home and work for both.
Which one raises prices?
Asda Mobile: Check at sign-up. giffgaff: No annual rise.
Which is better abroad?
Asda Mobile: 46 countries, 5GB. giffgaff: EU included, 5GB.
Asda Mobile£192
giffgaff£240Cheapest SIM with 10GB or more × 24, plus April rises
Live prices; rises estimated for a plan starting this month.
Over 24 months, the cheapest 10GB+ SIM costs £192 on Asda Mobile and £240 on giffgaff once April rises are added — Asda Mobile is £48 cheaper. Asda Mobile runs on Vodafone’s masts; giffgaff on O2’s masts.
Prices checked 28 October 2026 · facts checked monthly · How we compare
Asda Mobile vs giffgaff, side by side
| Asda Mobile | giffgaff | |
|---|---|---|
| Masts | Vodafone | O2 |
| Annual price rise | Check at sign-up | No annual rise |
| Roaming | 46 countries, 5GB | EU included, 5GB |
| Credit check | None | None |
| eSIM | No | Yes |
| Wi-Fi Calling | No | Yes |
| Cheapest SIM, 10GB+ | £5.95 a month | £8 a month |
| Cheapest SIM, 30GB+ | £7.95 a month | £8 a month |
| Cheapest SIM, Unlimited | £19 a month | £25 a month |
Highlighted = better on that line. Facts from network terms and Ofcom; prices live.
Our verdict
On price, Asda Mobile comes out ahead for a typical 10GB+ SIM: £48 less over two years once April rises are counted.
Coverage differs: Asda Mobile uses Vodafone’s masts and giffgaff uses O2’s masts. Check both on the mast owner’s postcode checker for home and work before you decide.
Pick Asda Mobile if…
- You want the lower 24-month cost for a 10GB+ SIM
- Vodafone signal is strongest where you live
Pick giffgaff if…
- You travel and want roaming included
- O2 signal is strongest where you live
Asda Mobile and giffgaff SIM only deals, live
FAQ
Asda Mobile vs giffgaff questions
Is Asda Mobile or giffgaff cheaper?
Asda Mobile, today: the cheapest 10GB+ SIM costs £8 a month, and over 24 months with April rises the gap is £48.
Do Asda Mobile and giffgaff use the same network?
No. Asda Mobile uses Vodafone’s masts and giffgaff uses O2’s masts.
Which has better roaming?
Asda Mobile: 46 countries, 5GB. giffgaff: EU included, 5GB.
Can I switch from Asda Mobile to giffgaff and keep my number?
Yes. Text PAC to 65075 from your Asda Mobile phone, give the code to giffgaff, and the number moves within one working day.