Document GSMA TS.43 carriers
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It is not possible to change the IMEI on a production device and GrapheneOS will never add
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support for this.</p>
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<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,
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VoNR, Wi-Fi calling may be handled by Google Firebase. Currently it is very rare for
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carriers to be using Firebase to handle this. It is unlikely, but technically possible, that
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with such carriers, you may be required to install sandboxed Google Play in order to obtain the
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former mentioned functionality where the carrier has not implemented fallback provisioning via SMS.
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Currently only US Cellular, Orange France, Cspire US, Cellcom US are using this standard.</p>
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<p>GrapheneOS includes bypasses for carrier restrictions on APN editing, tethering via
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USB, Ethernet, Bluetooth and Wi-Fi and the ability to disable 2G, actions which would not
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necessarily have been possible on the stock operating system.</p>
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