Samsung Galaxy Tab 2 311 comes only with wifi, but you can connect to internet using bluetooth. So during travel you can access internet on your samsung galaxy tab 2 311.
I connected my Samsung Galaxy tablet 311 to internet via Bluetooth and GPRS using my BSNL prepaid nokia E51 mobile phone.
Here is how to do it.
First Go to Google playstore and download the app BlueVPN and install it
With Bluevpn app you can connect any “GPRS [General Packet Radio Service] phone (like many common BlackBerry, Nokia, Samsung …phones) with tethered modem capability”.
Then pair your mobile phone and Samsung Tab using bluetooth.
In the GPRS settings add your APN or access point of your mobile phone internet connection. For BSNL it is bsnlnet
Once it is connected you can now access the internet. Though it is slow, it is useful during travels.
This worked for me and don’t know whether it will work for you so if you are having any trouble with bluevpn please contact the developer here