how to close the 4G?!
Yesterday i found that my 822 kept changing from 3G to 4G,or 4G to 3G,which cost power much.
So, how to close it?
does anyone know how?
Yesterday i found that my 822 kept changing from 3G to 4G,or 4G to 3G,which cost power much.
So, how to close it?
does anyone know how?