Which iOS devices have proximity monitoring?

Question

I'd like to know which iOS devices have a proximity sensor. Is there a list somewhere?

Answer 1

You can test in code to determine whether a device supports proximity monitoring:

iOS 7, iPhone, Proximity Sensor

And here is a hardware list:

http://en.wikipedia.org/wiki/List_of_iOS_devices#Features

So basically, all iPhones and nothing else :)