I own a Verizon Samsung Galaxy S4 and wanted to disable 4G/LTE to save battery power. I couldn’t find a setting, but there is a way.
While some versions of the S4 allow you to go to Settings > More networks > Mobile networks > Network mode > CDMA to disable 4G and allow a 3G only connection, the Verizon version does not. I searched Google Play for a free app that disables 4G, but couldn’t find one that actually worked with my phone.
Finally I tried 4G Switch for 99 cents and it’s the only app I’ve found that actually works for disabling 4G/LTE.
2. Once installed, open the app by tapping Apps >4G Switch.
3. Tap Start.
4. Select Phone information.
5. Select GSM/CDMA auto (PRL) for the preferred network type setting.
Your S4 will now connect via a 3G only connection and LTE will be turned off.
If you find another way to accomplish this, please share it in the comments section.