Acronym for General Packet Radio Service
This is how VodaFone provide IP connectivity over their cellphone network.
the number to dial for GPRS is "*99#"
The default APN (Access Point) for VodaFone is www.vodafone.net.nz, this however is on their internal network (has an IP address in the private range) and will not let VPN (PPTP) connections through.
If you wish to use a VPN you will need to change your connection profile to use an APN? that provides a public IP address. Vodafone suggest changing the connection profile to connect to web.vodafone.net.nz
Compare CDMA