I think it's crazy that they don't make the phone number mandatory also. I mean how many john smiths are dfo going to try and contact if a trap is fishing illegally, and if you want your trap returned if it's drifted away or got sucked under for a while in current how many people are going to bother looking up phone numbers to return them.
I do think most of the regular rec fishers do put their phone numbers on their bouys, but aheny is correct, you only need your name on it.
think I'll change my name to Leavemyf'n Trapalone, lol