1. The open-source version currently provides the cellular call (CS call only), SMS & MMS, and cellular data services and supports the dual-SIM framework.
2. The Hardware Device Interface (HDI) support is subject to the chip vendors' adaptation capability. For details, see [Telephony Development](../device-dev/subsystems/subsys-tel-guide).
2. The Hardware Device Interface (HDI) support is subject to the chip vendors' adaptation capability. For details, see [Telephony Development](../device-dev/subsystems/subsys-tel-overview.md).