not your phone/iPad that also runs tons of other applications, which could introduce conflicts.
Point of order (at least when it comes to Apple iPhones and iPads).
Unlike traditional Operating Systems, when it comes to said devices, unless you've been an idiot and "rooted" your Apple phone/pad, all apps run sandboxed.
This is an inherent part of the Apple phone/pad security model that apps cannot interact with each other or in unauthorised ways with the underlying operating system.
When you submit an App to the App Store, you list the external privileges your App requires (e.g. use of GPS), and Apple verifies your App does what you says it does and does not attempt to escalate beyond your declared uses.
Now, whether you'd use a phone/pad for primary aircraft navigation is another question...
