#一:项目中导入静态库: CoreTelephony.framework
#二:导入头文件
```
#import<CoreTelephony/CTTelephonyNetworkInfo.h>
#import<CoreTelephony/CTCarrier.h>
```
#三:实现验证方法
```
- (BOOL)isSIMInstalled{
CTTelephonyNetworkInfo*networkInfo = [[CTTelephonyNetworkInfoalloc] init];
CTCarrier*carrier = [networkInfo subscriberCellularProvider];
if(!carrier.isoCountryCode) {
NSLog(@"请安装好手机SIM卡后在拨打电话.");
returnNO;
}else{
NSLog(@"存在SIM卡");returnYES;
}
}
```








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