[ataplin777]

Hi everyone,

Mi unlocked AT&T Blackberry Curve 8310 Was working fine with my T-Mobile SIM card until one day in November "app error 523" appeared. Now i've reset the device and it shows:
SIM: Disabled
Network: Disabled
Network Subset: Disabled
Service Provider: Disabled
Corporate:Disabled
I know this means the device is technically unlocked but it says "No Valid SIM Card" at the top with my T-Mobile SIM! I have no idea what's wrong, and I know it's not my SIM card because it works in another T-Mobile phone. All help would be very appreciated.

Thanks.

[NJBlackBerry]

I am not kidding - are you 100% sure you have the SIM card in the right way?
That's the only plausible explanation.

Thanks.

[ataplin777]

Thanks for your reply. It's very appreciated. But yes, I've actually cleaned tha connectors wit a t-shirt and everything, and when I re-inserted the card I made sure it was in the right way and secured. I've done it more than once. I'm totally lost on this one and I'm sure many others are also.

[ataplin777]

Omg what a coincidence, I just did it 2 more times and it works Thanks Blackberry Forums. Sorry if I wasted your time though.

[NJBlackBerry]

It was most certainly NOT a waste of anyone's time. Glad it is working!!!!

Don't remove it!