public IEnumerable <ATCommunicator.PhonebookEntry> ListPhonebook() { comm.At(); var simInfo = comm.QueryPhonebookStorageStatus(ATCommunicator.PhonebookStorage.SIM); var memoryInfo = comm.QueryPhonebookStorageStatus(ATCommunicator.PhonebookStorage.Memory); return (EnumerableHelper.Concatenate(comm.QueryPhonebook(ATCommunicator.PhonebookStorage.SIM, 1, simInfo.UsedLocations), comm.QueryPhonebook(ATCommunicator.PhonebookStorage.Memory, 1, memoryInfo.UsedLocations))); }