首先，导入头文件：
#import <CoreTelephony/CTTelephonyNetworkInfo.h>
#import <CoreTelephony/CTCarrier.h>
添加方法：
// 判断设备是否安装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;
}
参考文章：http://stackoverflow.com/questions/10488898/iphone-detecting-sim-card-availability
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