Who to fix my SIM got while "Forbidden Network" while I am Roaming?

Question

I accidentally inserted my GSM Sim in a locked Nokia 6030 RM 225. When I put it back to my unlocked Sony Ericsson, the T-mobile network I am usually using is now telling me "forbidden network" same as cingular. I don't understand why it appeared now while I am using it for two months?

Do I have to go to T-mobile service or call the SIM's roaming hotline? Do I need to unlock the phone with my SIM?

Note: The Phone Nokia 6030 is locked in T-Mobile. My SIM is Globe Prepaid Sim that was roamed.

Please help me. I need to have my connections back as soon as possible.

I cannot send or receive SMS messages. On the select network, The T-Mobile and Cingular was Forbidden.

Answer 1

I would call your provider and claim ignorance (say your friend borrowed your phone and returned it not working) - you are paying for service - they have to make it work.