iPhone Device Network check(3G)

- (BOOL)isCellNetwork{

struct sockaddr_in zeroAddr;

bzero(&zeroAddr, sizeof(zeroAddr));

zeroAddr.sin_len = sizeof(zeroAddr);

zeroAddr.sin_family = AF_INET;

SCNetworkReachabilityRef target = SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr*)&zeroAddr);

SCNetworkReachabilityFlags flag;

SCNetworkReachabilityGetFlags(target, &flag);

if(flag & kSCNetworkReachabilityFlagsIsWWAN){

return YES;

}else{

return NO;

}

}