Need help with CYDIA (read please)

[smart.money]

I recently unlocked my IPHONE #G 3.0.1 and got a line with
t-mobile since then my CYDIA does not work correctly nor can i access my apps on my iphone can someone please help me???? AND WERE DO I GET NEW APPS FROM???? HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[blkcadi]

Need more explanation my friend. So you jailbroke and unlocked your phone and Cydia isn't working? Are you getting errors? What type.
I assume this is a 3G phone.

[smart.money]

Yes it is a 3g and what happens is I go into CYDIA and try to install something it seems as if it is going to install bu then there is nothing. Also do you happen to know how to unlock my iPhone 3gs 3.0 firmware so I can go to tmobile