Needed for VoLTE (Voice over LTE) https://en.wikipedia.org/wiki/Voice_over_LTE IMS(Ip Multimedia Subsystem) is an open industry standard for voice and multimedia communications over packet-based IP networks (VoLTE/VoIP/Wifi calling). NOTE: This package could be needed for messaging apps that send SMS/RCS code to verify your phone number.
Phones target this application