Is there a way for my tmobile sim card to work in a cingular phone?

[soccerkid8245]

My phone just broke and the only other one i have is a cingular sony ericsson but when i put the Tmobile sim card in it reads "insert correct smart card" what can i do to fix this??

 

[tasteyy]

You need to Unlock your Sony Ericsson Phone from network lock to use other GSM Network Sim card....You can use the unlock code from here Wickedunlock.com and unlock it....