Get network status in iOS7

Reachability.m

#import <CoreTelephony/CTTelephonyNetworkInfo.h>

typedef enum : NSInteger {
    NotReachable = 0,
    ReachableViaWiFi,
    ReachableVia2G,
    ReachableVia3G,
    ReachableVia4G,
    ReachableViaWWAN
} NetworkStatus;

- (NetworkStatus)networkStatusForFlags:(SCNetworkReachabilityFlags)flags
{
    PrintReachabilityFlags(flags, "networkStatusForFlags");
    if ((flags & kSCNetworkReachabilityFlagsReachable) == 0)
    {
        // The target host is not reachable.
        return NotReachable;
    }
    
    NetworkStatus returnValue = NotReachable;
    
    if ((flags & kSCNetworkReachabilityFlagsConnectionRequired) == 0)
    {
        /*
         If the target host is reachable and no connection is required then we'll assume (for now) that you're on Wi-Fi...
         */
        returnValue = ReachableViaWiFi;
    }
    
    if ((((flags & kSCNetworkReachabilityFlagsConnectionOnDemand ) != 0) ||
         (flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) != 0))
    {
        /*
         ... and the connection is on-demand (or on-traffic) if the calling application is using the CFSocketStream or higher APIs...
         */
        
        if ((flags & kSCNetworkReachabilityFlagsInterventionRequired) == 0)
        {
            /*
             ... and no [user] intervention is needed...
             */
            returnValue = ReachableViaWiFi;
        }
    }
    
    if ((flags & kSCNetworkReachabilityFlagsIsWWAN) == kSCNetworkReachabilityFlagsIsWWAN)
    {
        /*
         ... but WWAN connections are OK if the calling application is using the CFNetwork APIs.
         */
        returnValue = ReachableViaWWAN;
        // ensure system version lager than 7.0
        CTTelephonyNetworkInfo *info = [[CTTelephonyNetworkInfo alloc] init];
        NSString *currentRadioAccessTechnology = info.currentRadioAccessTechnology;
        if (currentRadioAccessTechnology) {
            if ([currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyGPRS] ||
                       [currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyEdge] ||
                       [currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMA1x]) {
                returnValue = ReachableVia2G;
            } else if ([currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyWCDMA] ||
                       [currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyHSDPA] ||
                       [currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyHSUPA] ||
                       [currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyeHRPD] ||
                       [currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMAEVDORev0] ||
                       [currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMAEVDORevA] ||
                       [currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMAEVDORevB]) {
                returnValue = ReachableVia3G;
            } else if ([currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyLTE]) {
                returnValue = ReachableVia4G;
            }
        }
    }
    
    return returnValue;
}