iOS查看是iPhone几：

#import 
     
       // import it in your header or implementation file.+ (NSString*) deviceName{    struct utsname systemInfo;    uname(&systemInfo);        return [NSString stringWithCString:systemInfo.machine                              encoding:NSUTF8StringEncoding];}
     

查看是iPhone还是iPad

NSString *device = [UIDevice currentDevice].model;

查看系统版本

[UIDevice currentDevice].systemVersion

 iOS在7以后不能查看IMEI信息，提供了一个唯一标识

[device.identifierForVendor UUIDString]

 查看网络状态

转自：

iOS7之后可以更精确判断网络状态

CTTelephonyNetworkInfo *netinfo = [[CTTelephonyNetworkInfo alloc] init];        NSString *radio = netinfo.currentRadioAccessTechnology;        if ([radio isEqualToString:CTRadioAccessTechnologyGPRS]) {            networkType = @"2G";        } else if ([radio isEqualToString:CTRadioAccessTechnologyEdge]) {            networkType = @"2G";        } else if ([radio isEqualToString:CTRadioAccessTechnologyWCDMA]) {            networkType = @"3G";        } else if ([radio isEqualToString:CTRadioAccessTechnologyHSDPA]) {            networkType = @"3G";        } else if ([radio isEqualToString:CTRadioAccessTechnologyHSUPA]) {            networkType = @"3G";        } else if ([radio isEqualToString:CTRadioAccessTechnologyCDMA1x]) {            networkType = @"2G";        } else if ([radio isEqualToString:CTRadioAccessTechnologyCDMAEVDORev0]) {            networkType = @"3G";        } else if ([radio isEqualToString:CTRadioAccessTechnologyCDMAEVDORevA]) {            networkType = @"3G";        } else if ([radio isEqualToString:CTRadioAccessTechnologyCDMAEVDORevB]) {            networkType = @"3G";        } else if ([radio isEqualToString:CTRadioAccessTechnologyeHRPD]) {            networkType = @"3G";        } else if ([radio isEqualToString:CTRadioAccessTechnologyLTE]) {            networkType = @"4G";        }