i would like to know why i have crashes with core telephony, i'm using it only to detect what is the connection is it 3g or 4g, also to know if i'm connected to the internet or no here is the crash trace 0 libobjc.A.dylib 0x1bb8c21c8 objc_msgSend + 8 1 CoreFoundation 0x1a6cbb41c -[__NSDictionaryM objectForKeyedSubscript:] + 184 2 CoreTelephony 0x1a734454c -[CTTelephonyNetworkInfo updateRat:descriptor:] + 144 3 CoreTelephony 0x1a7344430 -[CTTelephonyNetworkInfo queryRatForDescriptor:] + 164 4 CoreTelephony 0x1a73431b8 -[CTTelephonyNetworkInfo connectionStateChanged:connection:dataConnectionStatusInfo:] + 72 5 CoreFoundation 0x1a6de3724 __invoking___ + 148 6 CoreFoundation 0x1a6cb6d04 -[NSInvocation invoke] + 380 7 CoreFoundation 0x1a6cb7308 -[NSInvocation invokeWithTarget:] + 80 8 CoreTelephony 0x1a734d2cc void dispatch::async<-[CoreTelephonyClientMux sink:handleNotification:]::$_2>(dispatch_queue_s*, std::__1::unique_ptr<-[CoreTelephonyClientMux sink:handleNotification:]::$_2, std::__1::default_delete<-[CoreTelephonyClientMux sink:handleNotification:]::$_2> >)::'lambda'(void*)::__invoke(void*) + 44 9 libdispatch.dylib 0x1a69cb81c _dispatch_client_callout + 20 10 libdispatch.dylib 0x1a69d3004 _dispatch_lane_serial_drain + 620 11 libdispatch.dylib 0x1a69d3c00 _dispatch_lane_invoke + 404 12 libdispatch.dylib 0x1a69de4bc _dispatch_workloop_worker_thread + 764 13 libsystem_pthread.dylib 0x1f2a4e7a4 _pthread_wqthread + 276 14 libsystem_pthread.dylib 0x1f2a5574c start_wqthread + 8