I've had this issue for a few months now, and have been doing research, and cannot seem to find anyone with a similar problem.

When my phone goes offline, I choose voicemail, and it asks me to connect to my connection, and I say "yes", and it does a network search. Once it connects to my voicemail (or any other call, for that matter), I can't press any buttons on the Treo to hang the phone up - on screen or on the keypad. It just seems to lock up, and I have to do several reboots, go into other menus, and all kinds of funky things, just to get the phone working again.

This was a brand new phone that I purchased off eBay, and the guy advertised it as a Cingular phone. When I got the phone, I found out it was an AT&T phone. After finding this out, I purchased the software to change it over to Cingular, and I've used both Cingular's and AT&T's update software to try and fix the issue, but to no avail.

Anyone else have this problem, or know what it might be?