there are options on Nokia phone after plugging USB cable to the PC that read
Code:
Select Mode:
Media Player
PC Suite
Data Transfer
you need to select PC Suite or similar.
If there is no option just check your dmesg...if there is any message concerning modem attached, like this
Code:
[ 5528.759058] usb 2-1: new full speed USB device using uhci_hcd and address 3
[ 5528.918329] usb 2-1: configuration #1 chosen from 1 choice
[ 5529.730520] cdc_acm 2-1:1.8: ttyACM0: USB ACM device
[ 5529.733883] usbcore: registered new interface driver cdc_acm
[ 5529.733973] cdc_acm: v0.26:USB Abstract Control Model driver for USB modems and ISDN adapters
modem will show up as ttyUSB0 or ttyACM0
PS: we need to make sure the phone is detected as modem first before making any internet connection
HTH