When considering Apple iOS, which runs the iPhone, or Google Android, there is more than just a different operating system to consider. Apple iOS is much more secure compared with Google Android. These different operating systems account for the vast majority of phones and tablets in the market today. They look and act similar, but there are big differences in the way they are built, operate and the security they offer.
Apple iOS is a closed system. Google Android is an open system. This may describe the reason behind their approach to security.