I maaaay have taken my phone on an accidental trip in a pool and was given an old phone to use as temporary. Has a headphone port. Saw the radio app and realized how do many of my smart phones even had radio access even though they all are capable. Bastards
It's just a name you can google, it's not specifically 3g only. In practice what they want to do is to remove all voice services that are not VoLTE, which includes the older systems too. In Australia they even started to ban phone models that are not able to do emergency calls over VoLTE properly.