iOS Detect 3G or WiFi

Question

I am not sure if this is possible, but I have this scenario.

I have a website displayed in my UIWebView which has the link set in a UISegmentedController. They website can detect if you are on wifi or on the 3g network.

Now the segmented controller points to 2 different pages: 1 - An iPhone friendly login screen 2 - The home page, once you are logged in.

Now here is the question:

Can I program my application to detect whether it is to WIFI or 3G (I know you can do this), but then based on the answer go to segment 1 or 2

Kind of like this:

if (iPhone device is on 3g) {
    Go to Segment 1;
} else {
    Go to Segment 0;
}

Answer 1

Import Apple's Reachability and try this,

#import "Reachability.h"
#import <CoreTelephony/CTTelephonyNetworkInfo.h>

//Try this
Reachability *reachability = [Reachability reachabilityForInternetConnection];
    [reachability startNotifier];

    NetworkStatus status = [reachability currentReachabilityStatus];

    if(status == NotReachable)
    {
       NSLog(@"none");
        //No internet
    }
    else if (status == ReachableViaWiFi)
    {
        NSLog(@"Wifi");
        //WiFi
    }
    else if (status == ReachableViaWWAN)
    {
        NSLog(@"WWAN");


    //connection type
    CTTelephonyNetworkInfo *netinfo = [[CTTelephonyNetworkInfo alloc] init];
    _carrier = [[netinfo subscriberCellularProvider] carrierName];

    if ([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyGPRS]) {
        NSLog(@"2G");
    } else if ([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyEdge]) {
        NSLog(@"2G");
    } else if ([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyWCDMA]) {
        NSLog(@"3G");
    } else if ([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyHSDPA]) {
        NSLog(@"3G");
    } else if ([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyHSUPA]) {
        NSLog(@"3G");
    } else if ([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMA1x]) {
        NSLog(@"2G");
    } else if ([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMAEVDORev0]) {
        NSLog(@"3G");
    } else if ([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMAEVDORevA]) {
        NSLog(@"3G");
    } else if ([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMAEVDORevB]) {
        NSLog(@"3G");
    } else if ([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyeHRPD]) {
        NSLog(@"3G");
    } else if ([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyLTE]) {
        NSLog(@"4G");
    }

    }

References(Links may broke in future) :

• iOS Detect 3G or WiFi
• Detect carrier connection type (3G / EDGE / GPRS)
  
• What are the differences between 1G, 2G, 3G, 4G and 5G?
  
• CDMA2000
  
• wiki 2G
  

• What is the difference between CDMA and WCDMA network sim
  

• What is "EV-DO Rev. A"?

Answer 2

For swift we can use:

func getNetworkType()->String {
    do{
        let reachability:Reachability = try Reachability.reachabilityForInternetConnection()
        do{
            try reachability.startNotifier()
            let status = reachability.currentReachabilityStatus
            if(status == .NotReachable){
                return ""
            }else if (status == .ReachableViaWiFi){
                return "Wifi"
            }else if (status == .ReachableViaWWAN){
                let networkInfo = CTTelephonyNetworkInfo()
                let carrierType = networkInfo.currentRadioAccessTechnology
                switch carrierType{
                case CTRadioAccessTechnologyGPRS?,CTRadioAccessTechnologyEdge?,CTRadioAccessTechnologyCDMA1x?: return "2G"
                case CTRadioAccessTechnologyWCDMA?,CTRadioAccessTechnologyHSDPA?,CTRadioAccessTechnologyHSUPA?,CTRadioAccessTechnologyCDMAEVDORev0?,CTRadioAccessTechnologyCDMAEVDORevA?,CTRadioAccessTechnologyCDMAEVDORevB?,CTRadioAccessTechnologyeHRPD?: return "3G"
                case CTRadioAccessTechnologyLTE?: return "4G"
                default: return ""
                }

                // Get carrier name

            }else{
                return ""
            }
        }catch{
            return ""
        }

    }catch{
        return ""
    }


}

Answer 3

Class method is as follow

+(NSString*)connectedNetworkType {
     Reachability *reachability = [Reachability reachabilityForInternetConnection];
        [reachability startNotifier];

        NetworkStatus status = [reachability currentReachabilityStatus];

        if(status == NotReachable) {
            NSLog(@"none");
            //No internet
        }
        else if (status == ReachableViaWiFi) {
            NSLog(@"Wifi");
            //WiFi
            return @"Wifi";
        }
        else if (status == ReachableViaWWAN){
            NSLog(@"WWAN");
            //connection type
            CTTelephonyNetworkInfo *netinfo = [[CTTelephonyNetworkInfo alloc] init];
            //    _carrier = [[netinfo subscriberCellularProvider] carrierName];
            if (([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyGPRS])
                ||([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyEdge])
                ||([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMA1x])) {
                NSLog(@"2G");
                return @"2G";
            }
            else if (([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyWCDMA])
                     ||([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyHSDPA])
                     ||([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyHSUPA])
                     ||([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMAEVDORev0])
                     ||([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMAEVDORevA])
                     ||([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMAEVDORevB])
                     ||([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyeHRPD])){
                NSLog(@"3G");
                return @"3G";
            }
            else if ([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyLTE]) {
                NSLog(@"4G");
                return @"4G";

            }
        }
        return @"-1";//default unknown
}

Answer 4

#import <ifaddrs.h>
#import <arpa/inet.h>

BOOL CheckWiFi() {

    struct ifaddrs *interfaces = NULL;
    struct ifaddrs *temp_addr = NULL;

    BOOL hasWifi = NO;

    int err = getifaddrs(&interfaces);
    if(err == 0) {

        temp_addr = interfaces; 

        while(temp_addr) {

            if(temp_addr->ifa_addr->sa_family == AF_INET) {

                struct sockaddr_in *addr = (struct sockaddr_in *)temp_addr->ifa_addr;

                if(memcmp(temp_addr->ifa_name, "en", 2) == 0) {
                    hasWifi = YES;
                    break;
                }
            }

            temp_addr = temp_addr->ifa_next;
        }
    }

    freeifaddrs(interfaces);
    return hasWifi;
}

To check if you are in a wifi, this saves the costly check of making a connection. Check for ifa_name "bridge" to check for internet sharing.

Answer 5

If you don't want to import Reachability library or deal with notifiers, you can use this simple synchronous method:

typedef enum {
    ConnectionTypeUnknown,
    ConnectionTypeNone,
    ConnectionType3G,
    ConnectionTypeWiFi
} ConnectionType;


+ (ConnectionType)connectionType
{
    SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithName(NULL, "8.8.8.8");
    SCNetworkReachabilityFlags flags;
    BOOL success = SCNetworkReachabilityGetFlags(reachability, &flags);
    CFRelease(reachability);
    if (!success) {
        return ConnectionTypeUnknown;
    }
    BOOL isReachable = ((flags & kSCNetworkReachabilityFlagsReachable) != 0);
    BOOL needsConnection = ((flags & kSCNetworkReachabilityFlagsConnectionRequired) != 0);
    BOOL isNetworkReachable = (isReachable && !needsConnection);

    if (!isNetworkReachable) {
        return ConnectionTypeNone;
    } else if ((flags & kSCNetworkReachabilityFlagsIsWWAN) != 0) {
        return ConnectionType3G;
    } else {
        return ConnectionTypeWiFi;
    }
}

Answer 6

If you are using Xamarin or Monotouch you can use Reachability adapted class from Xamarin GitHub repository:

https://github.com/xamarin/monotouch-samples/blob/master/ReachabilitySample/reachability.cs

So add it to your project and call Reachability.InternetConnectionStatus()