iPhone EDGE/3G网络端口范围?有人知道吗?

我试图在iPhone应用程序中访问61616,SCReachability代码表明我有一个有效的网络,但我尝试写入61616时超时。有谁知道:

A.如果iPhone EDGE/3G网络的端口范围有限或不允许连接到此端口?

B.如何明确检查此端口的访问权限。这是我的“网络是否可以访问”代码(借用苹果的例子),它检查“foo.bar.com”,但没有显示如何检查“foo.bar.com:61616”。

感谢您的帮助!

- (BOOL)isDataSourceAvailable{
static BOOL checkNetwork = YES;
BOOL _isDataSourceAvailable = NO;
if (checkNetwork) { // Since checking the reachability of a host can be expensive, cache the result and perform the reachability check once.
    checkNetwork = NO;

    Boolean success;    
    const char *host_name = "foo.bar.com";

    SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithName(NULL, host_name);
    SCNetworkReachabilityFlags flags;
    success = SCNetworkReachabilityGetFlags(reachability, &flags);
    _isDataSourceAvailable = success && (flags & kSCNetworkFlagsReachable) && !(flags & kSCNetworkFlagsConnectionRequired);
    CFRelease(reachability);
}
return _isDataSourceAvailable;

}