Question

Is there any way to identify if iPhone supports CDMA or GSM network. Any Apple API in Objective-C which can provide this information.

Answer 1

You might examine model id with the function (credits):

#include <sys/types.h>
#include <sys/sysctl.h>
NSString* machine () {
        size_t size;

            // Set 'oldp' parameter to NULL to get the size of the data
            // returned so we can allocate appropriate amount of space
        sysctlbyname("hw.machine", NULL, &size, NULL, 0); 

            // Allocate the space to store name
        char *name = malloc(size);

            // Get the platform name
        sysctlbyname("hw.machine", name, &size, NULL, 0);

            // Place name into a string
        NSString *machineid = [NSString stringWithUTF8String:name];

            // Done with this
        free(name);

        return machineid;
    }

Function will return string like @”iPhone3,3″ which stands for iPhone 4 (CDMA/Verizon). It might be difficult to gather full table of various model numbers. Some of the models descriptions could be found here. You’ll have to expand table of models as new models will appear.