Invalid AT&T SIM card on unlocked phone

[drfunk83]

Hello

I recently unlocked my Pearl 9100 (orignal carrier was Telcel-Mexico) so I could use it in the US. Then I bought an AT&T SIM card, but I cannot use it in this phone as it says it is invaild.

I'm sure I'm inserting it in the right position, and I'm sure my phone is unlocked as I tried another T-Mobile SIM and it did work.

Also, the AT&T SIM card seems to be OK as I can use it without problems on the phone it originally came from.

Any suggestions? Could I perhaps be missing a setting?

Thanks!

[freethisberrydotcom]

check to see if it currently unlocked first:

freethisberry.com/support.php

[drfunk83]

Thanks for the tip, I just compared the screenshots against what my phone currently shows and it does match with the unlocked one.

Any other ideas?

[freethisberrydotcom]

Maybe try reflashing the device ...

[blackberry-unlocking710]

Try to go into the network selection and searching for the network manually.