When I first got my phone last spring I was having trouble with it but then through the summer it was fine, now starting to get trouble with it again. It freezes and then restarts itself and sometimes comes up Insert Sim. I was told I may need a new sim card as mine is at least a couple of years old and was told the new ones are slightly bigger. Anyone had the same trouble and fixed it? I havent ordered a new sim yet as its £17.50. I am on 3 network. Anyone help??