CB? Maybe you can get a walkie talkie app but there is nothing like CB on phone. (If there was it would be banned!)

How/why would it be banned, if all it did was provide emulated 'channels' for shared voice comms among users in a local geographic area?

Banned because The Man don't want you to find out local voice doesn't require a subscription-based carrier.

TPC is not The Man. (-:

Sidney Schaefer, is that you?

Came here to say this. There's nothing like a CB radio or the mentioned scanner on a phone. (Scanner apps are streaming from actual scanners in the real world somewhere).