APN Setup - Android
Go to Applcations -> Settings
If you are having operating system 2.2x or 2.3x;
Go to Wireless and Networks -> Mobile Networks
If you are having operating system 4.x;
Click on More and go to Mobile Networks
Click on Access Point Names -> New APN
You need to change the following fields here.
Name - Exetel
APN - Use the Correct APN value based on your plan.
Authentication Type - You can use either none or PAP or CHAP
Once you save the settings, your new APN value will be listed and you can use that one.