Because the differences between single- and dual-SIM builds are very small, almost all developers of Sony devices - including me - distribute only single-SIM builds.
We need to patch some props in /system/build.prop (or /system/vendor/build.prop, /vendor/build.prop, depending on the device), mainly:
persist.vendor.radio.multisim.config=dsds
ro.telephony.default_network=9,1 # (or 9,0, or 9,9, depending on the device)
ro.product.name=<dualsim device name>
persist.vendor.radio.block_allow_data=0 # for kumano devices
and substitute all occurrences of the device variant name, e.g. f8331, with
the dual-SIM variant name (f8332).
We also need to patch the vintf manifest at /vendor/etc/vintf/manifest.xml to
include a second instance of the telephony-related HALs. See the added slot2
and new instances from the _ss to the _ds variants here:
android.hardware.radio: single-SIM vs dual-SIMvendor.qti.hardware.radio: single-SIM vs dual-SIM.
To view the actual inner workings, take a look at the source. Particularly interesting is the script that does the heavy lifting.
Download
sony-dualsim-patcher-v4.zip at sx.ix5.org
Changelog
- Version 4: Fix issues with A/B devices, Android 10 compat
- Version 3: Internal rework, more devices
- Version 2: Compatibility with Xperia XZ Project Treble builds
- Version 1: Initial release