Disabling 4G is somewhat of a difficulty, but you can download
https://play.google.com/store/apps/details?id=net.andirc.lteonfoff&feature=search_result (yes it says Thunderbolt, but works with RAZR), and it will take you to a menu of "Phone info". Scroll down the menu and just before the "Turn off radio" button is a line with a drop-down. It should be on "
LTE/CDMA/EvDo/GSM/WCDMA" by default, which is all the radios, including Global (GSM). To change to 3G only, select "
CDMA auto (PRL)". To select everything but GSM (including LTE), select "
LTE/CDMA/EvDo", then just hit the Back button or Home button on the phone.