How do i connect my T-Mobile phone to an At&t network?

[popster0909]

When ever i try to connect it says not allowed. My phone is a Samsung Katlyst.

 

[BillieJeanmmOOLALAmm]

idk

 

[returned]

When ever i try to connect it says not allowed. My phone is a Samsung Katlyst.

The phone is locked with T-mobile network.Only if you unlock it the mobile will be able to access other networks.To unlock you can approach Theunlockarena.com and get the required unlock code for your Samsung Katalyst.