Tesco, giffgaff, SMARTY, iD, VOXI, Lebara — not one mast between them. Here's whose network each one rents, and the three rules that keep cheap from becoming annoying.
cenioklo is an independent info site. Zero connection to Three, O2, Sky, EE, Vodafone or anyone else — their names only mark what a page is about. We never take payments, never see accounts, never ask for codes or card details. For anything about your bill or contract, your network's official line (printed on your bill) is the right call. Ours (020 3996 8779, standard landline rate) is for general guidance only.
Every cheap SIM in Britain rents one of four real networks. Learn the landlord and half your choices make themselves.
| Brand | Rides on | Signature move |
|---|---|---|
| Tesco Mobile | O2 | Satisfaction-survey streak; family controls |
| giffgaff | O2 | Zero contracts; community support |
| Sky Mobile | O2 | The Roll data bank |
| SMARTY | Three | Radically simple monthly plans |
| iD Mobile | Three | Relentless value pricing |
| VOXI | Vodafone | Social apps outside the data allowance |
| Lebara | Vodafone | International minutes built in |
| 1pMobile | EE | Pay-per-use on the biggest network |
Hosts as generally understood at July 2026 — arrangements can change; confirm with each brand.
The brand's adverts don't carry your calls — the host's masts do. Coverage mission on the host.
Wi-Fi Calling, eSIM and 5G differ between brands on the SAME masts. Never assume host parity.
Support always belongs with your brand. A Tesco problem = Tesco's support, even though every signal bar is O2's.
Ring us to talk through switching, coverage, complaints or anything on this site. We can't open accounts, take payments or speak for any network — but we can make it all make sense.
020 3996 8779 Standard landline rate (020) · usually inside your free minutes · we never ask for passcodes, bank or card details