A friend of mine sent this to me, it actually works pretty good..
TiKL - Touch To Talk (PTT) for Android
my dad and me just tested it tonight, i wasnt that impressed. so problems
the sound it makes when you first receive a message is a doorbell, its not very loud
i could not get it to sound and vibrate, just one or the other.
you do not know who is contacting you
the quality was ok but if the reception is just a bit low the tail end of the message skips.
plus, we both have verizon, we call and text each other for free.