I have been given an iPhone 5 by a family member as my one is broken. I paid for it to be unlocked and when I connect to iTunes it says 'Congratulations your phone is unlocked'. However when I put my sim card (Tmobile) in it continually says 'Searching' or 'No service' in the top left hand corner. For a few seconds when I first put the sim in it did get service, but that disappeared and has not happened since.
I have tried re-setting network settings. I have tried all the normal switch off and on. I have tried restoring through iTunes all to no avail.
Can anyone help me??
Dale.