During a call phone goes from 3G to 2G but not Vice Versa
Just wanted to see if something I am seeing is normal. I made a call from my house which is in a 3G area. I drove out of town on the call and during the call my phone switched to EDGE. That worked perfectly with no problem. The problem I had was on the way back. I made a call while on EDGE and then when I got home, back in the 3G area, it stayed on EDGE and I could not (while still on the call) access my e-mail or internet from my phone. Is that the way the phone is designed? To hop from 3G to EDGE, but once on EDGE not to go back? Just want to make sure there is not a problem with my phone.
Thank you all in advance for your help.
MacBook Air, Mac OS X (10.5.4)