# Telephony Kit

- ArkTS API
  - [@ohos.telephony.call (Call)](js-apis-call.md)
  - [@ohos.telephony.data (Cellular Data)](js-apis-telephony-data.md)
  - [@ohos.telephony.observer (observer)](js-apis-observer.md)
  - [@ohos.telephony.radio (Network Search)](js-apis-radio.md)
  - [@ohos.telephony.sim (SIM Management)](js-apis-sim.md)
  - [@ohos.telephony.sms (SMS)](js-apis-sms.md)
  <!--Del-->
  - [@ohos.telephony.call (Call) (System API)](js-apis-call-sys.md)
  - [@ohos.telephony.data (Cellular Data) (System API)](js-apis-telephony-data-sys.md)
  - [@ohos.telephony.observer (Observer) (System API)](js-apis-observer-sys.md)
  - [@ohos.telephony.radio (Network Search) (System API)](js-apis-radio-sys.md)
  - [@ohos.telephony.sim (SIM Management) (System API)](js-apis-sim-sys.md)
  - [@ohos.telephony.sms (SMS) (System API)](js-apis-sms-sys.md)
  - [@ohos.telephony.vcard (VCard) (System API)](js-apis-vcard-sys.md)
  <!--DelEnd-->
- C API
  - Module
    - [Telephony Data](ndk-apis-telephony-data.md)
    - [Telephony Radio](ndk-apis-telephony-radio.md)
  - Header Files
    - [telephony_data.h](telephony__data_8h.md)
    - [telephony_radio.h](telephony__radio_8h.md)
    - [telephony_radio_type.h](telephony__radio__type_8h.md)
  - Structs
    - [Telephony_NetworkState](_telephony__network_state.md)
- Error Codes
  - [Telephony Error Codes](errorcode-telephony.md)