I went back to Orange last year, thinking that the network would be better since the T-Mobile merger. I live in South Wales and it 'appears' the network is good (4 bars), but seriously it is dire. Missed calls when I apparently have a good signal, plus text messages 24 hours later! That bad I paid to end the contract 10 months into a 24 month contract. Vodafone are good so far, also my o2 SIM is good, but if I must recommend a network I would go with Voda.