1# JS API Changes of the Telephony Subsystem 2 3The table below lists the APIs changes of the telephony subsystem in OpenHarmony 3.2 Beta3 over OpenHarmony 3.2 Beta2. 4 5## API Changes 6 7| Module| Class| Method/Attribute/Enumeration/Constant| Change Type| 8|---|---|---|---| 9| ohos.telephony.data | data | getDefaultCellularDataSlotIdSync(): number; | Added| 10| ohos.telephony.radio | ImsServiceType | TYPE_SMS | Added| 11| ohos.telephony.radio | ImsServiceType | TYPE_UT | Added| 12| ohos.telephony.radio | ImsServiceType | TYPE_VIDEO | Added| 13| ohos.telephony.radio | ImsServiceType | TYPE_VOICE | Added| 14| ohos.telephony.radio | ImsRegInfo | imsRegTech: ImsRegTech; | Added| 15| ohos.telephony.radio | ImsRegInfo | imsRegState: ImsRegState; | Added| 16| ohos.telephony.radio | ImsRegTech | REGISTRATION_TECH_NR | Added| 17| ohos.telephony.radio | ImsRegTech | REGISTRATION_TECH_IWLAN | Added| 18| ohos.telephony.radio | ImsRegTech | REGISTRATION_TECH_LTE | Added| 19| ohos.telephony.radio | ImsRegTech | REGISTRATION_TECH_NONE | Added| 20| ohos.telephony.radio | ImsRegState | IMS_REGISTERED | Added| 21| ohos.telephony.radio | ImsRegState | IMS_UNREGISTERED | Added| 22| ohos.telephony.radio | radio | off(type: 'imsRegStateChange', slotId: number, imsType: ImsServiceType, callback?: Callback\<ImsRegInfo>): void; | Added| 23| ohos.telephony.radio | radio | on(type: 'imsRegStateChange', slotId: number, imsType: ImsServiceType, callback: Callback\<ImsRegInfo>): void; | Added| 24| ohos.telephony.radio | radio | getImsRegInfo(slotId: number, imsType: ImsServiceType, callback: AsyncCallback\<ImsRegInfo>): void;<br>getImsRegInfo(slotId: number, imsType: ImsServiceType): Promise\<ImsRegInfo>; | Added| 25| ohos.telephony.sim | sim | getOpName(slotId: number, callback: AsyncCallback\<string>): void;<br>getOpName(slotId: number): Promise\<string>; | Added| 26| ohos.telephony.sim | sim | getOpKey(slotId: number, callback: AsyncCallback\<string>): void;<br>getOpKey(slotId: number): Promise\<string>; | Added| 27