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Press *#22745927 to enable hidden menus. then install Netmonitor from the Play Store. Open Netmonitor > hit the menu button > Hit "Field Test".

Once in Test Mode you can go to UMTS > DEBUG SCREEN > PHONE CONTROL > NETWORK CONTROL > BAND SELECTION to set GSM Band preference.

then starting at the very beginning over test mode again... CDMA > COMMON > NEXT PAGE > NEXT PAGE > PREF MODE SET to select GSM/WCDMA ONL