Feel free to try it out in your school, on a football match, festivals, concerts, ... anywhere where the classic mobile signal is unreachable and/or too expensive. The more of you there is, the faster delivery you can expect.
In comparison to Firechat (which has very similar goals), our app works (in the first place ;)) and it works even when your phone is in the sleep mode. You don't have to pay attention to it at all.
WARNING: this is the first version, there's no security whatsoever, don't reveal any private information in messages.
P.S. As you might have noticed, this is a 0.9 version, i.e. more like a beta. Feel free to comment/report any bugs you encounter! And of course, we're happy to hear your positive experiences as well ;) Also, don't be disappointed by the speed of delivery, next version will be much faster and working on tablets, too.