I have iOS 9 on my device it says Mobcrush is an unverified/untrusted developer
Please make sure to verify Mobcrush under your Permissions settings. As
iOS 9 treats permissions differently, you'll want to go to Settings —> General —> Profile —> Mobcrush. You should be able to verify it there.
Please note: In iOS 9.2 you will want to go to Settings > General > Device Management > Mobcrush