Which phones support Dual 4G/VoLTE?
How to switch 4G to LTE?
Can I set Only 4G on my phone?
7. How to restrict the apps to use data in the background?
8. What are the tips on saving data?
How to set Network mode, like 4G(preferred), on my phone?
How to change the network mode?
6. How to close the data network?