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SIM868 module features GPRS function (2G Network), so we could use SIM868 module to dial-up networking using PPP.
As we know, SIM868 module features GPRS function, however, it is controlled with AT instructions, and AT instruction is not convenient in Raspberry Pi. If the function could be operated just like operate WIFI it will be much better. In this case, we describe how to use PPP to dial-up networking.
sudo apt-get install ppp
sudo su
cd /etc/ppp/peers cp provider gprs
sudo nano gprs
pppd call gprs &
ifconfig eth0 down ifconfig wlan0 down
route add -net 0.0.0.0 ppp0