On most Android phones, you can access a hidden testing menu to tweak a few interesting radio settings. All it takes is a few seconds with the keypad and a rudimentary understanding of your phone's network technology.
First pull up the dialer, and then enter *#*#4636#*#*. This is called a USSD code, and it should immediately boot you into the testing menu. Some phones won't respond to the keypad code, but know that the menu is inside the system, and a number of apps in Google Play can do the same job. Regardless, inside the menu you'll find an assortment of radio stats and logs, but the Phone information menu is of particular interest. From here, you can use a drop down menu to control which networks your device connects to.
3 phone testing menu
In the Phone Testing Menu, you can exert full control over which network your handset taps into.
If your carrier or phone manufacturer didn't give you a 4G toggle, you can force the phone to stick to 3G as a battery saver. Or if you want 4G speed but are in a marginal 4G service area, you can set it to LTE-only mode to prevent the radio from switching over to 3G. Keep in mind, you'll have to change these settings back later, and disabling 3G will usually prevent you from doing voice calls.
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