Mobilink Mobile Internet Settings Guide
2. Manual Settings
  1. Go to Settings > Wireless & networks > Mobile networks >Access Point Names.
  2. Press the ‘Menu’ key and select “New APN”.
  3. Now use the following settings:

APN Name:   Mobilink internet

APN:            jazzconnect.mobilinkworld.com
User name:  Mobilink
Password:    Mobilink

Authentication Type:  None
APN Type: default

Screenshots step by step for better understand.

APN Name: Mobilink internet
APN: jazzconnect.mobilinkworld.com
User Name: Mobilink
Password: Mobilink
All other fields leave default
then save it

Note: you only need to add APN Name and APN name as you wish and APN must be jazzconnect.mobilinkworld.com then save setting and select access point  that you have added if you have more then one Access Point Names in settings. after save setting if you not seen any of these Edge/3G/H/H+ sign mean you have now internet access if not seen then restart your hand set. now should be work.

If you still have any problem then visit Mobilink Customer Service center or call at 111 Help Line.

For other networks setting visit Mobile internet setting

Good Luck!