i can't seem to find a similar thread regarding my problem. i got a international (chinese) galaxy s3 that i recently rooted and installed omega custom rom on in order to get google play. my carrier is t-mobile and after installing the sim card, i only see the "E" with the up and down arrows. even i have 4G data plan, but cannot use it. is there an app or some way to adjust the reception band to get 4G on this phone?