p2p over 2G on android

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http://stackoverflow.com – Am trying to develop application on/in android work along with device hardware system. Am newb for android. I want make some talk between my application and device. Device system like 2G/3G/4G/wifi like networks. I want make p2p connection. I don’t know how I can start this with android. Is there have any function can call this hardware through android or derect (HowTos)