Before we start connecting to Internet using your phone is not a good way cause it is costly so be [COLOR=Red]AWARE[/COLOR] of what you are doing.
I am running [COLOR=DarkOrange]Ubuntu 10.04 LTS[/COLOR] & using [[COLOR=Red]N73[/COLOR]]("http://en.wikipedia.org/wiki/Nokia_N73") Nokia phone connected with DKU-50 cable. & pppconfig is installed be default so there is no need to install it.
1- Connect your phone & when prompt select [COLOR=Red]PC Suite[/COLOR] Mode so your phone can be recognized as a modem.
2- Open terminal and run this command
sudo dmesg | tail
[ 6274.113214] usb 4-2: configuration #1 chosen from 1 choice
[ 6274.127179] cdc_acm 4-2:1.8: ttyACM0: USB ACM device
[ 6274.133111] usb 4-2: bad CDC descriptors
[ 6274.143475] usb 4-2: bad CDC descriptors
[ 6358.144057] usb 4-2: USB disconnect, address 5
[ 6363.572030] usb 4-2: new full speed USB device using uhci_hcd and address 6
[ 6363.744998] usb 4-2: configuration #1 chosen from 1 choice
[ 6363.758924] cdc_acm 4-2:1.8:**[COLOR=Red] ttyACM0[/COLOR]**: USB ACM device
[ 6363.764907] usb 4-2: bad CDC descriptors
[ 6363.772421] usb 4-2: bad CDC descriptors
3- From terminal run this command
sudo pppconfig
5- Enter your Internet provider name or any name you like. remember you will need this name to make the connection. I will call it isp.
6- Use your DNS server type mine is [COLOR=Red]Dynamic[/COLOR].
7- Select [COLOR=Red]PAP[/COLOR] authentication method.
8- Enter you username. You can't leave this field empty.
9- Enter your password. You can't leave this field empty.
10- Enter you port speed. If you are not sure just accept the default.
11- Select method of dialing as [COLOR=Red]Tone[/COLOR].
12 - Enter phone number.
13- You can select yes to detect modem automatically or no to specify it by you self i will choose no & i will use the name form step2 preceded with /dev
/dev/ttyACM0
15- Quit the tool
_Connect & Disconnect:_
1- connect:
sudo pon [COLOR=Red]**CONNECTION_NAME_AT_STEP_2**[/COLOR]
sudo poff [COLOR=Red]**CONNECTION_NAME_AT_STEP_2**[/COLOR]
If you want to change something you can edit [COLOR=Blue]/etc/ppp/peers/CONNECTION_NAME_AT_STEP_2 [/COLOR]
credit goes here