I bought a Blackberry Curve 8310 about 9 days ago.
Love the phone, hate the problems.
My problem is every so often my when I try to make a call or text someone I get call failed message and when anyone tries to call me they go right to voicemail.
I have excellent signal strength 5 bars.
This will go on for an hour or so, and then everything will go back to normal.
I called AT&T (5-6 times) they don't have any answers. Everything on my account is setup correctly
I've taken out the battery/sim card/ turned it off and on nothing works.
Replaced the sim card. Replaced the phone and I'm still having the same problems.
I've had AT&T for the past 3-4 years, and different cell phones but never any problems.