Reachability *reachability = [Reachability reachabilityForInternetConnection];
NetworkStatus remoteHostStatus = [reachability currentReachabilityStatus];
if (remoteHostStatus == NotReachable) {
// not reachable
} else if (remoteHostStatus == ReachableViaWiFi) {
// reachable via Wifi
} else if (remoteHostStatus == ReachableViaWWAN) {
// reachable via WWAN
}