Although cellphone hardware is capable of communicating directly with the hardware of other cellphones, this is rarely done. We describe the design of a low-bandwidth peer-to-peer ad-hoc network, AllNet, to provide connectivity among smart mobile devices using established direct, ad-hoc, and delay-tolerant algorithms. AllNet can be used for secure interpersonal communication in a number of situations, most notably in emergencies, but also for social networking, chatting, and organizing. The low resource usage of AllNet encourages individuals to support others' communication, as is needed in this peer-to-peer setting.