OMG, I'm glad I found this thread.
We have nine new Cingular 7290s, and we're in an area of Virginia where Cingular just "acquired" SunCom.
Activated the devices late last week, and they worked fine until yesterday afternoon when all 9 users came flying over to my desk with "Data connection refused"/lowercase gprs.. Did the "Register Now" on all 9, and got "Registration blah blah sent successfully", but never received the confirmation in the Messages area. Battery out/back in fixed two of them for about 5-10 minutes, then they went back to gprs.
Spent 2+ hours on the phone with Cingular this afternoon to no avail. As of 5PM ET, all 9 were still down. They gave no indication that they had heard of any network problems. Then again, they don't seem to really understand the whole SunCom network thingie, so .. who knows???
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