A pocket antenna allows you to create a network of own chat

GoTenna

GoTenna, a device that allows you to create a wireless communications network for medium range where there is no cell phone service, using any Android phone or iPhone, and an antenna that can enter into any backpack, and has its own battery. The idea behind GoTenna is to allow anyone who has that antenna to communicate with other users relatively nearby, in areas where no mobile phone service, and rural areas, mountains, places where the congestion charge falls – a stadium – other countries not to pay roaming, and so…

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