I know I'm being a numpty, but I really struggle with this stuff! I can get and send emails from it fine but it won't let me text or make calls, presumably because I still can from my old phone. What do I do to get it to swap over so it's just the new one? I had it move all my contacts etc over, I just don't know how to make it recognise the new model as my one and only. Please advise!