Unlocked AT&T 8310 Does NOT Recognize T-Mobile SIM Card!
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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:
Network Subset: Disabled
Service Provider: 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 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.