#include <dlfcn.h>
#define PRIVATE_PATH "/System/Library/PrivateFrameworks/CoreTelephony.framework/CoreTelephony"
- void getImsi(){
#if !TARGET_IPHONE_SIMULATOR
  void *kit = dlopen(PRIVATE_PATH,RTLD_LAZY);  
  NSString *imsi = nil;
  int (*CTSIMSupportCopyMobileSubscriberIdentity)() = dlsym(kit, "CTSIMSupportCopyMobileSubscriberIdentity");
  imsi = (NSString*)CTSIMSupportCopyMobileSubscriberIdentity(nil);
  dlclose(kit);  
  UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"IMSI"
                          message:imsi 
                          delegate:self
                     cancelButtonTitle:@"OK"
                     otherButtonTitles:nil];
  [alert show];
  [alert release];
#endif
}

NSString *imsi = CTSIMSupportCopyMobileSubscriberIdentity();
NSString *userMobileType = [StatisticsOperation getCarrier:imsi];
 getCarrier 方法如下
+ (NSString *)getCarrier:(NSString *)imsi {
  if (imsi == nil || [imsi isEqualToString:@"SIM Not Inserted"] ) {
    return @"Unknown";
  }
  else {
    if ([[imsi substringWithRange:NSMakeRange(0, 3)] isEqualToString:@"460"]) {
      NSInteger MNC = [[imsi substringWithRange:NSMakeRange(3, 2)] intValue];
      switch (MNC) {
        case 00:
        case 02:
        case 07:
          return @"China Mobile";
          break;
        case 01:
        case 06:  
          return @"China Unicom";
          break;
        case 03:
        case 05:  
          return @"China Telecom";
          break;
        case 20:
          return @"China Tietong";
          break;
        default:
          break;
      }
    }
  }
  return @"Unknown";
}

+ (NSString*)getPhoneNumber
{
     NSString *num = [[NSUserDefaults standardUserDefaults] stringForKey:@"SBFormattedPhoneNumber"];
     NSLog(@"Phone Number: %@", num);
     return num;
}