If anyone out there is looking a sweet deal on a mobile phone and decent tariff look no further that an unlocked Motorola Moto G and a Sim from Giff Gaff.
The Moto G is easily the best budget phone, and by that I don't mean the cheapest either. Just google for confirmation.
Pair that up with a giff gaff Sim and your on a winner. Be warned though, Giff Gaff runs on O2. So if you got bad coverage with O2 then they will be just as bad.
This phone runs Android, so anyone with a modern tablet that doesn't have an apple on it should feel right at home with it.