I got an i830 phone from a friend and I tried my i95 sim on it and it was able to get my contacts, but I couldn't make or recieve any calls. Every time I try to make a call or alert someone it says " Service Restricted" So, I thought it was because I had a older sim card, so I upgraded to a 64K sim and it still is doing the same thing. I also tried it w/ other friends that have i830's and it does it w/ their cards too. My new 64K sim works fine on my i95 and my friend's i830 but just not in mine so I know it has something to do w/ the phone. What will help me w/ this problem??? A master reset?? PLEASE HELP!!!!!