My mobile is Samsung Galaxy Trend (gt7392) , it's new. But, my mobile is not so updated,its 4.1.2. But, I want to root my phone and install the updated andriod . Now, I have heard that , if I root my mobile, then, my phone would be totally useless !!!!! But, is it true ?? If I install a total new software or Android os , then, how my mobile is going to be totally useless ?