http://stackoverflow.com/questions/10488898/iphone-detecting-sim-card-availability
#import <CoreTelephony/CTTelephonyNetworkInfo.h>
#import <CoreTelephony/CTCarrier.h>
/// 判斷設(shè)備是否安裝sim卡
+(BOOL)isSIMInstalled
{
CTTelephonyNetworkInfo *networkInfo = [[CTTelephonyNetworkInfo alloc] init];
CTCarrier *carrier = [networkInfo subscriberCellularProvider];
if (!carrier.isoCountryCode) {
NSLog(@"No sim present Or No cellular coverage or phone is on airplane mode.");
return NO;
}
return YES;
}
