@camaleo, I wanna try to help you.
First of all copy this into your app module:
.config(['$compileProvider', function($compileProvider){
$compileProvider.aHrefSanitizationWhitelist(/^\s*(geo|mailto|tel|maps):/);
}]);
Then, put this code in your ‘config.xml’ file:
<access origin="tel:*" launch-external="yes" />
<access origin="mailto:*" launch-external="yes" />
<access origin="geo:*" launch-external="yes" />
<access origin="maps:*" launch-external="yes" />
Build your application and finally, try it in a real iOS device. I think there’s no phone app on iOS emulator.
This worked for me for phone calls, emails and maps both Android and iOS devices.
PD: Sorry for my english.