I have purchased a Samsung galaxy grand prime six months back; which having S/N of R58K42FKZ9Y and IMEI nos. 356458098078595 & 356459098078l593. I deeply regret that I purchased this phone and I have been facing hang and low battery backup issues since the purchase. Before this phone I had experience with 4 different brand mobile phones; but, I never felt such disappointing feeling before. Worthless phone.