Gprs sent and receive random byte. WHY?

Shosholoza cavaldan at
Fri Jun 18 20:57:38 CEST 2010

I use the connection for track my freerunner. So I send out  only few byte
every x seconds. Really I 
need only a port open. For this I hope with a firewall to resolve the
problem. But problem is to 
understand  how do it. My provider charge me for all byte than I received or
sent. I am starting to belive it is a strategy of my provider.
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