Gadget needed :
A. Iphone / Ipad [Borrow your friend's phone ;) ]
B. Your own Android phone
How to extend:
1. Register your Android WhatsApp phone number on WhatsApp for iPhone (doesn't need to change the sim card, just register the number).
2. Enter 3 digit SMS code sent to your sim card and enter it on WhatsApp for iPhone.
3. Re install whatsapp for Android, then register your number that already registered in iPhone and you will get 10 years license.
ENJOY!!
