iOS应用系统获取qq和拨打电话

qq临时会话：

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"mqqwpa://im/chat?chat_type=wpa&uin=1147726728&version=1&src_type=web&web_src=oicqzone.com"]];

打电话：

NSString *telStr = [NSString stringWithFormat:@"tel://400-080-1515"];

            [[UIApplication sharedApplication]openURL:[NSURL URLWithString:telStr]];