Use APKPure App
Get LTESwitch old version APK for Android
2G - 4G Swith
For nexus5 or nexus6 Only
GSM (GSM_Only) , AUTO （GSM/LTE Auto)，LTE （LTE_Only)
Auto connect to LTE ：disable "Auto Disable mobile data network" and enable "Auto Enable LTE"
only tested on nexus5 and nexus6
need root