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If you want to connect 2 SIM300's via GPRS:
- You open a GPRS connection on one as a server
- You open a GPRS conneciton on the other as a client and connect to the server SIM300
Again, there are plenty of posts on this forum that show you how to make the GPRS connection with a SIM300/340 (I know I've posted this info numerous times myself). You can also look at the FAQ on this site: http://www.madeeasykits.com/Faqs.asp.
If you have a problem and can be specific, I'd be happy to try to help.