1速缨，撥打完電話回不到原來的應(yīng)用窍奋，會停留在通訊錄里，而且是不彈出提示直接撥打
NSMutableString *str=[[NSMutableStringalloc]initWithFormat:@"tel:%@",@"電話號碼"];
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:str]];
2，打完電話后回到原來的程序描姚，也會彈出提示
NSMutableString *str=[[NSMutableStringalloc]initWithFormat:@"tel:%@",@"電話號碼"];
UIWebView *callWebview = [[UIWebViewalloc]init];
[callWebviewloadRequest:[NSURLRequestrequestWithURL:[NSURLURLWithString:str]]];
[self.view addSubview:callWebview];
3,這種方法也會回去到原來的程序里（注意這里的telprompt）松捉，也會彈出提示
NSMutableString* str=[[NSMutableStringalloc]initWithFormat:@"telprompt://%@",@"電話號碼"];
[[UIApplicationsharedApplication]openURL:[NSURLURLWithString:str]]夹界；
