Which cheap UK network actually works at your address?
giffgaff, Smarty, Voxi, iD Mobile and friends don't own masts — they piggyback on EE, O2, Three or Vodafone. A cheap SIM is only a bargain if its host network is strong at your address. Ofcom data, every UK piggyback SIM — check yours:
Availability from Ofcom Connected Nations 2025 open data (district level) — contains Ofcom data © Ofcom, OGL v3. Piggyback SIMs usually don't get 5G+ (standalone 5G) even where the host network has it, and some are deprioritised at busy times. Provider links may be affiliate links — if you switch through one, the provider pays us a small commission at no cost to you. Don't mind helping us out? Use our links. Rather not? Every provider is a search away, no hard feelings. The best option always ranks first — even when it pays us less, or pays us nothing.
Want the full picture? Estimate actual 5G speeds at your postcode → · Full fibre vs 5G checker →