I have a Samsung S4 with Verizon and I was using a 4G/ 3G switch app to toggle between 3G and 4G in areas with bad reception After the upgrade to 4.3, that app has stopped working. Does anyone have any idea how to toggle to 3G alone? The native menu in the phone has always only had option to choose only LTE + CDMA, with no option to choose CDMA alone. However the app I had installed earlier (4G by Viaero) allowed me to choose 3G only. Thanks for your help.