The first time i purchased my Android..Tecno S3 to be precise...i immediately slotted in my Sim and i Installed some Android Apps that were on my old Memory Card...i Immediately went to data connection and switched it on..i started receiving messages that my remaining data balance is 5mb...i was suprised...cos i had 20mb...2 minutes later my data got finished...i didn't know it's because of google play store and apps updates...i spent almost 500 naira to purchase more data that day...
So share your own experience When u started using your smartphone(s)...

I didn't have any funny experience with my first ever android phone (Samsung galaxy pocket) I read and knew about android OS very well before purchasing my first android phone.