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A USSD and SMS client for Rockchip or Telechips based Android Tablets.
The tablets use external USB and/or embedded mini-PCI 3G modems for data connectivity (e.g. Huawei EM770). The modems don't allow voice calling, but do allow USSD and SMS access through standard AT commands.
The Android application will need to modify the Vendor RIL and wrap the appropriate USSD and SMS command functionality through the Android RIL to the upper application layers.
This can be easily done in embedded Linux but is not as simple in Android because of the lack of RIL support for these modems.