I changed my unit from iphone 4 to iphone 5s. I restored everything from the last backup. Now i activated my viber on my new unit (with the same # i used on the previous one)....and found out that i have to download again those stickers. But for my purchased one, i tried restoring it but nothing happened. And when i check the market,i have to buy it again. What might be the problem? Any solution on this? Appreciate the help.