UIWebView *callWebview =[[UIWebView alloc] init] ;
// tel: 或者 tel://
NSURL *telURL =[NSURL URLWithString:@"tel://10086"];
[callWebview loadRequest:[NSURLRequest requestWithURL:telURL]];
[self.view addSubview:callWebview];
原文地址:http://blog.csdn.net/cerastes/article/details/38340687