ok so i got my iPhone 3Gr (it’s a refurb) a week ago and out of the blue it will just say “No Sim Installed” on the screen. Did this for the first time monday so i turn off the phone turned it back on No problem. Well yesterday it did it 3 time and the last time i had to eject the sim with the phone on and put it back in with the phone off to get it to work again. do you think i need a new phone or a new sim?