[silky_green]

Hi. Hoping someone can help here. I just got a new Blackberry 7290, AT&T branded, but when I put in my existing Cingular SIM card in there, I get a data connection refused error although the phone works fine. Calling Cingular/AT&T for help, they tell me that the AT&T and Cingular data networks are not compatible and that there's no way for me to use my Cingular SIM on my AT&T Blackberry. Is this true? I'm thinking there's some setup things that's required for my existing Cingular account for me to access the Blackberry network, no? Please help. Thank you.

[Talldog]

When they say that Cingular an AT&T's data networks are not compatible, they may be referring to AT&T using 850MHz and Cingular using 1900MHz, but the 7290 is a quad-band phone that supports all GSM/GPRS frequencies. I suspect that the problem may be that you do not have Cingular's BlackBerry data service, which is different from their "regular" data service.

[stonent]

I got the same error when putting a SIM from an AT&T UMTS card into an AT&T GSM Blackberry

[silky_green]

Is anyone actually using a AT&T branded 7290 on the Cingular network?

[sharpycl]

I'm using an AT&T branded BB, with an AT&T branded SIM chip. It displays Cingular on the main screen sometimes, but mainly AT&T Wireless appears in the ribbon on the main screen. Hope that helps in some way.

[silky_green]

Acutally was interested in whether a Cingular SIM (with Blackberry data access) works on a AT&T unit. I'm thinking it doesn't based on some other things I've read regarding different network settings between AT&T and Cingular. The AT&T unit is preconfigured with AT&T configuration so either I would have to figure out all the Cingular equivalents or try and get help from Cingular support (which I've heard is not very good).

[Talldog]

Originally Posted by silky_green

Acutally was interested in whether a Cingular SIM (with Blackberry data access) works on a AT&T unit. I'm thinking it doesn't based on some other things I've read regarding different network settings between AT&T and Cingular.

Well, there's an easy way to find out. Add the service and test it. If it doesn't work, cancel the service.