2G is here to stay

Refarming 3G in areas where 4G signal is strong is most probable, if your 4G is good why do you even need 3G?

Of course, for non VoLTE phone, signal switch to 2G is possible whenever call is made

First, need to ensure all phone is at least 4G capable, seen too much tv shopping selling smartphone up to 3G only, pity those who get duped since they didn't disclose the network capability on show