Sony Ericsson

From Main menu ⇒ Settings
Scroll right four times in the tab to reach the connectivity section
Scroll down and select Data Comm.
Scroll down and select preferred service
Select GPRS and GSM and press Back to reach connectivity menu
Scroll down and select Internet settings ⇒ Internet profiles ⇒ New profile
Press Add and enter the name of the Internet profile: For Ex: Name: Internet and press ok
Select New account ⇒ GPRS data
Now enter name – Name: Lycamobile and press continue
Enter APN: data.lycamobile.tn
Scroll down and select UserName: lmtn
Scroll down and select Password: plus
Press Save