phone trouble again

My new iphone lost service again. This morning we visited Genius bar in Apple store. I ended up getting a new iphone after my previous old was diagnosed as defective. It was disappointing to have a not-working phone, actually I think I knew why it broke. I restored my first 2G iphone which was jail-broken data to my first 3G phone. I think those jail-breaking stuff must make some mess. It's disappointing the system cannot be more robust. But, I was impressed how good the service was. I got a new iphone without any strings attached after they found they cannot fix my problem. Impressive. I guess I will still be an Apple user.