How to enable developer settings on Android 4.2 | Android Central.
I just got myself a Nexus 4 for cross-platform development, but it didn't initially appear as a device in Xamarin Studio. Initial Googling and SO'ing indicated a non-existent "Settings->Application->Developer" route to enable debugging on the phone.
Instead, the correct sequence is "Settings->About phone->{tap 7 times} Settings->Developer Options"