I use Samsung Galaxy A5(2015) and have just upgraded the firmware to Android 6.0 (Mashmallow). The phone supports 3G but the option to set it there is LTE/3G/2G (auto connect) on Network mode.

How do I get the phone to use 3G only?


Try to call ##4636## then select Phone/Tablet Information, scroll below and you saw Spinner, select 3G/WCDMA only


Goto Settings > Cellular/Mobile Network > Your 3G SIM > Network (3G only)

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