Hi, recently updated to android 4.3 and now phone displays a warning that I am roaming. called TM and was informed nothing is wrong with phone. Suggested I should contact Samsung which I did and was I formed that phone may have an antenna problem. Phone is currently out of warranty but stills works but so e dropped calls. Called TM again and asked about LTE service for this phone since not a (L) certified phone. I was told all models of Galaxy S3 work fine with LTE service in New York City. Any suggestions on how to stop roaming display. Already tried firmware update, rebooting, cleaning apps, ext. I am not even sure if there are different versions of the same TM Galaxy S3 phone.