iPhone 4, contacts lost
 

I have iphone 4 and it happened twice that I lost all contacts suddenly. This time battery was drained out and when restarted, there were no contacts. What can be the reason and how to avoid it.

very easy when see u have save it many contect and other data in ur fone....to make a backup of ur fone throw i tune in ur fone.....and when this accident happen to u to put ur back up of ur fone back to fone throw i tune

many softwre are on net , but all are paid

i think find in googel for how to take backup many software available in .hope ur phone book problem solved .