OC调用系统拨号
NSString *tel = [NSString stringWithFormat:@"telprompt://%@",_lbl_tel1.text];
[[UIApplication sharedApplication]openURL:[NSURL URLWithString:tel]];
NSString *tel = [NSString stringWithFormat:@"telprompt://%@",_lbl_tel1.text];
[[UIApplication sharedApplication]openURL:[NSURL URLWithString:tel]];