title: iOS Caller ID Retrieve
body: <p>I'm trying to get the caller number (for jailbroken devices) with this code:
  extern CFTypeRef CTCallCopyName(void*, CTCall* call);</p>
  
  <p>NSLog(@"%@", CTCallCopyName(NULL, (CTCall*)call));</p>
  
  <p>I receive the error:
    "CTCallCopyName(void*, CTCall*)", referenced from:
  ld: symbol(s) not found for architecture armv6</p>
  
  <p>I have Core Telephony linked with my project.
  Maybe my prototype is wrong... i don't know. Any ideas?
  Xcode 3, sdk 4</p>