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13.2.5 GPRS
As mentioned earlier the only difference between dialing modem-to-modem or
using the phone as a GPRS gateway to internet is just a matter of configuration.
Basic knowledge about modem commands and dialing is assumed, so modem-to-
modem dialing is not described here. However, some short hints on GPRS
connections are given below.
A GPRS connection is established by means of modem configuration rather than
actual dialing. Two AT command strings are vital for GPRS connections. First a
configuration string is used to specify things like protocol and network provider.
This string is passed during modem initialization and in my case it is:
AT+CGDCONT=1,”IP”,”services.vodafone.net”,””,0,0
After initialization the actual dialing is substituted by sending a connection
request to the network provider. The request contains the type of connection you
want to use, e.g PPP. It should look similar to:
AT+CGDATA=”PPP”,1
When used in a connection tool like Kppp the sequence of AT commands may
look similar to the one in the snapshot below.
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