Continuous data send and receive with unknown source

When I connect my ipad to the lightning cable, no matter if it is connected to PC or it is going to be charged, if the wifi is on, it will start sending and receiving data continuously and with a high speed.
I want to stop this thing from happening because it nearly consumed all of my internet account
What is the reason?

>
>
Did you download from
http://java.sun.com/products/javacomm/
If so, there is an example in
commapi\samples\SerialDemo
but this only sends characters back and forth.
You will have to create a design to handle the send
and recieve. What will the data be?
Will you transmit files? Maybe you need to create
something like XMODEM.
Will you transmit media streams? Maybe you should look
at JTAPI
http://java.sun.com/products/jtapi/
(which is only a definition, or a real reference
implementation like:
http://gjtapi.sourceforge.net/
==================================================================I'm sending information from a client for a credit verification, This information is sent in a variable, and then the modem receives a file with the results.

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