How do I test if IOS device has telephone capabilities?

Question

I want to offer phone support in my app at the press of a button for iPhone users, and display a phone number for iPad/iPod Touch users. Rather than detecting what device the user has, is there a better way to query the hardware to see if it has telephony capabilities? This would continue to work should iPad 3G one day open up for voice calls.

I am aware of how to limit an app to devices through the UIRequiredDeviceCapabilities key, but I'm not looking to restrict platform, just detect capabilities.

Answer 1

Check if application can open tel url:

if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"tel:+11111"]])
  // device has phone capabilities

Answer 2

Here is some code written by Max Horváth, that detects the device model. I didn't test it so far but my search gives me that result

http://www.iphone4gapp.net/device-detection.html