Invalid/Duplicate Serial / Voucher Number - Please Contact Customer ServiceIn ist attempt i got no notification for successful submission and now getting this error.What to do? No email received regarding successful submission.

I tried everything, home screen backup not getting completed on Samsung cloud, via smart switch. All data backup and restore but home screen is not.It shows home screen backup not finished after 100 percent.Cache cleared, good lock disabled... Not w...

Tab received....

Hello,Whenever i switch mobile data ON on my Zong SIM, it first switch ON on 4G then move to 3G, even in full 4G coverage. I change sim slots, replace sim but still getting the same.If i switch on airplane mode then, it go to 4g. And when ever next ...