This is one of the reasons Apple does a code review on apps posted on itunes.
Cell phones...even iPhones are the biggest security problem on the internet.
The exploits using iPhones in 10 years you can count on the fingers of one hand. . . compared to several million for Android. So including iPhones in your citation claiming cell phones being the "biggest security problem on the internet" is a huge stretch. iPhones simple are not part of the problem.