Decided to upgrade my mobile phone from my Nokia 6303. Have ordered a Giff Gaff sim and now need a phone to put it in. Needs to be PAYG and preferably unlocked. Have been looking at the Orange San Francisco and know how to unlock it. What other phones would be worth getting. Been looking at HTC Desire but can't see it for under £350 and don't know if its worth the extra on the San Fran. Help please.