How can I exchange data via IP on my T-Mobile cell phone?

I have multiple T-Mobile Andr开发者_如何学编程oid cell phones and I am writing an app to go on all the phones that exchanges data via IP. Is there a way to get the private IP addresses of the cellular connections, and send data to each phone using those addresses?

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You might wish to create some kind of intermediary web service that all of the devices talk to to share their IPs. Some kind of simple, RESTful API that I device could call to POST their IP/MEID and fetch the other devices' IPs.

You can use something like this to get your device IP.