Needs to take Three preferably or Giffgaff(I have a spare sim kicking about).

My nexus 5 power button has broken and need a replacement til they send me out a new one.

Tescos do some for £8 payg

That'll do . I'm off away with work for 2 days thsi week so could do with a phone.

Are they 3G? 3 won't work on non 3G handsets and I think those very cheap phones are just 2G...