Q: PDP AUTHETICATION FAILURE FOR IPAD

Hi TVSRMURTHY,

I see you're having cellular network troubles.  I found this article and it sounds like it would help with what you are describing:

iPad (Wi-Fi + Cellular Models): Troubleshooting a cellular data connection

http://support.apple.com/kb/TS4249

Step 4 states "Check for a carrier settings update." and links to "iOS: Updating your carrier settings" (http://support.apple.com/kb/HT1970), which I would also suggest trying.

Cheers!

- Ari