1# Telephony Kit 2 3- ArkTS API 4 - [@ohos.telephony.call (Call)](js-apis-call.md) 5 - [@ohos.telephony.data (Cellular Data)](js-apis-telephony-data.md) 6 - [@ohos.telephony.observer (observer)](js-apis-observer.md) 7 - [@ohos.telephony.radio (Network Search)](js-apis-radio.md) 8 - [@ohos.telephony.sim (SIM Management)](js-apis-sim.md) 9 - [@ohos.telephony.sms (SMS)](js-apis-sms.md) 10 <!--Del--> 11 - [@ohos.telephony.call (Call) (System API)](js-apis-call-sys.md) 12 - [@ohos.telephony.data (Cellular Data) (System API)](js-apis-telephony-data-sys.md) 13 - [@ohos.telephony.observer (Observer) (System API)](js-apis-observer-sys.md) 14 - [@ohos.telephony.radio (Network Search) (System API)](js-apis-radio-sys.md) 15 - [@ohos.telephony.sim (SIM Management) (System API)](js-apis-sim-sys.md) 16 - [@ohos.telephony.sms (SMS) (System API)](js-apis-sms-sys.md) 17 - [@ohos.telephony.vcard (VCard) (System API)](js-apis-vcard-sys.md) 18 <!--DelEnd--> 19- C API 20 - Module 21 - [Telephony Data](ndk-apis-telephony-data.md) 22 - [Telephony Radio](ndk-apis-telephony-radio.md) 23 - Header Files 24 - [telephony_data.h](telephony__data_8h.md) 25 - [telephony_radio.h](telephony__radio_8h.md) 26 - [telephony_radio_type.h](telephony__radio__type_8h.md) 27 - Structs 28 - [Telephony_NetworkState](_telephony__network_state.md) 29- Error Codes 30 - [Telephony Error Codes](errorcode-telephony.md) 31