Yeah, but cellphone wifi range is really crap. Well, it was with the handsets I've used. I wonder how tough it would be to set up an ad hoc connection between two phones... Can't say I've ever needed to do it.
Ptt still uses the GSM network though, doesn't it? And as far as I know, it's not available (affordably at least) in SA?
I may of course be completely wrong.
So if it's easy to do ad hoc connections with cellphones, I wonder what the code looks like for the capturing of audio through the mic and for outputting it on the speaker. I'd think that it's quite nice and neat, but will have some form of pretty codec being used instead of using PWM and whatnot.