The guys at Everything Apple Pro must have had a bunch of extra iPhones taking up space because they decided to see how many it took to stop a 5.45mm round from an AK-74.
The question is, how many iPhones you would have to have in your pocket in order for them to save your life? They experimented with 8, mostly iPhone 6’s but included a Samsung Galaxy X6 bringing up the rear.
The answer, not to ruin anything for you, was less than 8.
*Obligatory disclaimer: always wear eye and ear pro when on the range, and don’t rely on your smart phone for ballistic protection no matter what the interwebs say.