Yep. If anything will stop it, the battery will. But a phone isn't going to stop much. This guy is insanely lucky. It could have missed the battery and gone straight thru the phone and injured or killed him. I also want to know what caliber and type of bullet this was. Nothing in the article about it. That couldn't have been a large caliber. Most likely 9mm or smaller. If that had been a .45, the bullet would have gone through the phone like a hot knife thru butter. The bullet may even have had enough energy to go completely thru the victim.
It wasn't a 9, a phone isn't going to do shit against a 9. And for the record, a 45 penetrates less hard material than a 9mm, because it has such a large surface area.
This was most likely a .22 LR.