1# Telephony 2 3## Overview 4 5Defines C APIs for cellular data module. 6 7**Since**: 13 8## Files 9 10| Name| Description| 11| -- | -- | 12| [telephony_data.h](capi-telephony-data-h.md) | Defines C APIs for cellular data module.| 13| [telephony_radio.h](capi-telephony-radio-h.md) | Defines C APIs for the radio module.| 14| [telephony_radio_type.h](capi-telephony-radio-type-h.md) | Declares the structs for the C APIs of the radio module.| 15