I've been to the O2 shop and obtained a new micro-sim. The guy at the shop explained what to do to switch my contract to the new sim but I just want to make sure I'm not going to lose anything before I start the switch. How do I check whether stuff is stored on my sim or the hard drive of my phone? and if it is in on the hard drive (or is it called internal memory?) of my phone, how do I transfer it? Will everything that's on my iphone 3 transfer to itunes when I plug it into my computer? Can I then transfer it to my new phone? Anything else I should know? Thank you!