Network vs network
VOXI 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. VOXI uses Vodafone’s masts and giffgaff uses O2’s masts. Check coverage at home and work for both.
Which one raises prices?
VOXI: No annual rise. giffgaff: No annual rise.
Which is better abroad?
VOXI: Passes from £2.60 a day. giffgaff: EU included, 5GB.
VOXI£240
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 £240 on VOXI and £240 on giffgaff once April rises are added, about the same. VOXI runs on Vodafone’s masts; giffgaff on O2’s masts.
Prices checked 28 October 2026 · facts checked monthly · How we compare
VOXI vs giffgaff, side by side
| VOXI | giffgaff | |
|---|---|---|
| Masts | Vodafone | O2 |
| Annual price rise | No annual rise | No annual rise |
| Roaming | Passes from £2.60 a day | EU included, 5GB |
| Credit check | None | None |
| eSIM | Yes | Yes |
| Wi-Fi Calling | Yes | Yes |
| Cheapest SIM, 10GB+ | £10 a month | £8 a month |
| Cheapest SIM, 30GB+ | £10 a month | £8 a month |
| Cheapest SIM, Unlimited | £35 a month | £25 a month |
Highlighted = better on that line. Facts from network terms and Ofcom; prices live.
Our verdict
On price they are level for a typical 10GB+ SIM: about £240 over two years each, April rises included.
Coverage differs: VOXI 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 giffgaff if…
- You travel and want roaming included
- O2 signal is strongest where you live
VOXI and giffgaff SIM only deals, live
FAQ
VOXI vs giffgaff questions
Is VOXI or giffgaff cheaper?
About the same today: the cheapest 10GB+ SIM costs around £10 a month on both.
Do VOXI and giffgaff use the same network?
No. VOXI uses Vodafone’s masts and giffgaff uses O2’s masts.
Which has better roaming?
VOXI: Passes from £2.60 a day. giffgaff: EU included, 5GB.
Can I switch from VOXI to giffgaff and keep my number?
Yes. Text PAC to 65075 from your VOXI phone, give the code to giffgaff, and the number moves within one working day.