I have a data logger with a fastrack modem. The SIM card has a GPRS plan. The system is in Mumbai. I have set up a ftp server and http web in the data logger to control it. When the modem connects, get an IP (this IP changes along the connection time, dynamic IP ) but I can connect with the data logger. If I use a tracert IP address tool the signal looses in a server in Mumbai. I have used this system with the same configuration abroad without problems. The vodafone's techns don't give me any advice or solution to the problem.:confused: