This just happened to me today at home. My 8700 worked fine last night, today I turn it on and I get a SOS signal. So I took my SIM card out, put it into another cell phone and I get no signal (no network connection).

Since I had business in Sacramento today I tested my BB there. I got a GSM connection, but still no phone/email/internet....so I switched again, put my SIM card into my other cell. Got a few bars for my connection but still could not make a phone call or access the internet.

Any ideas why this occurs? Do I need to get a new SIM card from Cingular or could this be an account issue? Thought I'd check here first before I try my patience with Cingular reps.

If your account is all paid up then my guess would be a SIM error... But it could be that someone geeked your account up as well... Best to call them and see what the issue is....