it's possible

It's possible, when your crucial data can’t be restored any more in your iPhone after:

1> accidentally deleting:
2> getting in trouble with the plenty of irreplaceable data lost when your iPhone is broken, smashed, cashed or damaged, or even not synchronized while out in the field;
3> Or your iPhone data information vanished after Jailbreak, failed upgrade, or factory settings restore;

The “lost data” from iPhone is not considered “lost forever.”