iOS Native iPhone Button for Calling

I have an iPhone application and within the applicatio开发者_如何学运维n, the user has can click a button which will make a phone call to a particular phone number.

Is there a built in icon or button or something like that which would work well or look good for this functionality? For making a phone call? Just something small.

Nothing in the iOS SDK ;-( You should try this web site : http://www.cocoacontrols.com there is a small library to have cool buttons in pure objectif-c

Check out

http://www.teehanlax.com/downloads/iphone-gui-psd/

And

http://www.teehanlax.com/downloads/iphone-4-guid-psd-retina-display/

For the Retina Display