There are a lots of smart mobiles in the market.
Some support only GSM (or) both GSM and WCDMA(3G)
But there are others which do not support/work on any GSM network world wide.
i,e.which is not a GSM device.
Some of them are Karbonn Smart Tab2(ST2),(ST7),(ST8),(ST9),(ST10).
Suppose if you had any of the above tabs,don’t think that you are away from your friends.
whatsapp will also work on these devices(tabs).
All you need is to follow the below procedure…
But before that you need to have a other mobile with a SIM card, and your own smart tab
1. Install the application on your tab
2. Launch the application
3. Enter the mobile number (in which whatsapp not installed) and tap on “OK” button
4. After 2 minutes,mobile B will receive a encrypted message from the mobile A registered SIM1(mobile) number.
5. After 5 minutes,the entered mobile number(device) will receive a message from Whatsapp server which contains 6 digits code.
6. After the total time (10 minutes), it displays a popup showing “SMS verification has failed,continue voice verification by calling the entered number”.
7. After tapping on “call me” button,again a popup appears with “Enter code here” field.
8. As soon as we tap on “call me” button, a call from Whatsapp server will come to the entered mobile number.
9. This call will continue till we attend the call.
10. If the call was answered, a 6 digit number will be heard by voice.
11. If we enter the 6 digits code which was heard, Your smart tab will get registered with the entered number and call gets automatically disconnected.
12. Otherwise if we enter the 6 digits code which was received as an SMS, Your smart tab will get registered with the entered number.
Now you can stay connected with your friends using whatapp in your smart tab.
Your friends will able to see your entered registered mobile only.
Cons: There should be an user interface in whatsapp menu to add a contact(phone) manually.
which is a drawback in whatspp when installed in a device which does not support GSM Network.
Understanding WhatsApp 