Switching iPhone 3GS SIM Cards
My question is by changing SIM cards will I lose any data from the phone, bearing in mind if the Three signal isn't very good in my area I'll want to put my o2 SIM card back in and revert to my old plan. What I don't want to do is change to the Three SIM and find that I can't go back to using my o2 SIM.
Thanks for any help.
iMac, Mac OS X (10.6.2)