Document GSMA TS.43 carriers

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flawedworld 2022-05-04 00:19:17 +01:00 committed by Daniel Micay
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It is not possible to change the IMEI on a production device and GrapheneOS will never add
support for this.</p>
<p>Android 12 introduced support for the <a href="https://www.gsma.com/newsroom/wp-content/uploads//TS.43-v8.0-2.pdf">GSMA TS.43</a> standard, where provisioning for VoLTE,
VoNR, Wi-Fi calling may be handled by Google Firebase. Currently it is very rare for
carriers to be using Firebase to handle this. It is unlikely, but technically possible, that
with such carriers, you may be required to install sandboxed Google Play in order to obtain the
former mentioned functionality where the carrier has not implemented fallback provisioning via SMS.
Currently only US Cellular, Orange France, Cspire US, Cellcom US are using this standard.</p>
<p>GrapheneOS includes bypasses for carrier restrictions on APN editing, tethering via
USB, Ethernet, Bluetooth and Wi-Fi and the ability to disable 2G, actions which would not
necessarily have been possible on the stock operating system.</p>