How to change the carrier logo on the iphone without jailbraking it?

I have straight talk iPhone that uses att's towers. I got the iphone off of ebay and then put a sim in it. It says TFW at the top, is there anyway to make it say att. I tried carrier editor but it did not have this carrier on the list.

The simpliest solution is you back-up and restore your phone. When your phone asks you to update your carrier settings, select no/cancel. Your phone should not say TFW anymore.

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