Probably a very stupid question but here goes. My very old iphone (6) is on its last legs and I really need to buy a new one. On the apple website I can get an iphone SE for £429 (can't afford the latest model) and was wondering if I can just put my sim from my old one in. I'm on EE and have a very cheap contract - less than £10 a month so I really want to continue with that and also keep my phone number.