[android-developers] Is there a way to get a WAN IP address from a phone based on its phone number?

I am trying to develop an android application, through I could share some files or other applications in real time(can be thought as a miniature version of remote desktop sharing). So I am thinking of trying to set up a P2P connection between 2 phones, for that phones would be requiring IP address of each other. Is there any way by which I can get the IP address of the other device by just using the phone no.

Could you please post some other suggestions for setting up a P2P connections??

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