判斷 iPhone 是否插入了 SIM 卡，可以參考蘋果官網的 systemconfigure framework 教程，將下面的代碼復制到頭文件

extern NSString* const kCTSMSMessageReceivedNotification;
extern NSString* const kCTSMSMessageReplaceReceivedNotification;
extern NSString* const kCTSIMSupportSIMStatusNotInserted;
extern NSString* const kCTSIMSupportSIMStatusReady;

id CTTelephonyCenterGetDefault(void);
void CTTelephonyCenterAddObserver(id,id,CFNotificationCallback,NSString*,void*,int);
void CTTelephonyCenterRemoveObserver(id,id,NSString*,void*);
int CTSMSMessageGetUnreadCount(void);

int CTSMSMessageGetRecordIdentifier(void * msg);
NSString * CTSIMSupportGetSIMStatus(); 
NSString * CTSIMSupportCopyMobileSubscriberIdentity();

id  CTSMSMessageCreate(void* unknow/*always 0*/,NSString* number,NSString* text);
void * CTSMSMessageCreateReply(void* unknow/*always 0*/,void * forwardTo,NSString* text);

void* CTSMSMessageSend(id server,id msg);

NSString *CTSMSMessageCopyAddress(void *, void *);
NSString *CTSMSMessageCopyText(void *, void *);

    然後引入 CoreTelephony.framework ，即可利用 [CTSIMSupportGetSIMStatus() isEqualToString:kCTSIMSupportSIMStatusNotInserted] 進行判斷。