Instal gnome-ppp

1. #apt-get install gnome-ppp

2. Open gnome ppp in Applications -> Internet -> Gnome PPP

3. Type username and password

4. Type phone number

5. Open Setup

6. Detect modem device

7. Open init string

8. Change init 2 with “AT&FW3+MS=V90,1,28800,33600,28800,56000″

9. Close setup configuration

10. Connect to the world