Or you could go into build.prop, change ro.radio.network.type to enable then change network mode In the network settings menu
Sent from my LG-E970 using xda app-developers app
First of all THANKYOU! you saved my ass big time. I searched for the LTE- off button long ago and found bubkis. I never thought to look in build.prop. The switch is there to enable the config menu, but the key is ro.radio.networkmode (at least on the ATT ICS rom). Just set the value to 'enable' (disable by default) and two new menu items appear in the network settings menu. The one you mention allows you to set the network connection priority so you can choose 2g/3g or 2g/3g/LTE, but there's also a menu item (a switch, really) called '2g only' if you find the need to go GSM-only for some reason.