What’s the correct URL for placing a call on an iPhone?

Question

Is the code for calling on the iPhone automatically

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@\"tel:11111111111\"]]);

Answer 1

SwiftArchitect's answer doesn't fit all. I wanted to actually initiate an automatic call, not prompt.

So there is a difference between tel and telprompt.

tel: actually initiates the call.

if let url = URL(string: "tel:\(phoneNumber)") {
  if UIApplication.shared.canOpenURL(url) {
    UIApplication.shared.openURL(url)
  }
}

telprompt: prompts for call or cancel.

if let url = URL(string: "telprompt:\(phoneNumber)") {
  if UIApplication.shared.canOpenURL(url) {
    UIApplication.shared.openURL(url)
  }
}

I didn't know the difference. Question also asks for calling. So this kind of answer would have helped me save time.