4G connection disappear during call on Samsung s6 Edge

magenta5051794

    I was using AT&T before, recently moved to T-Mobile.

     

    I just noticed that the network switched off the 4G connection if i initiate a call. After the call ends, the 4G automatically restored or I have to take the phone to Airplane mode and bring back the network to get the 4G connection.

     

    I checked the mobile network option where LTE/3G/2G (auto Connect) is selected.

     

    I never see LTE on the screen too.

     

    Any help would highly be appreciated.

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