Have you thought your iphones are impervious to external elements because it is waterproof or resistant? Apparently it will flat-line if exposed to helium. So the next time you are doing helium voices at a party you may want to think twice if your iphone is sitting next to you according to the article below. 🙂 Of course you likely are not in danger of destroying it unless you are capable of blowing several pounds of it directly at your iphone while it is in a bag. 😉 But with a helium filled bag within 8 minutes the iphone was completely dead. For more information read the article below.