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faq: Add note about IMS domains #1213

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6 changes: 4 additions & 2 deletions static/faq.html
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Expand Up @@ -1201,14 +1201,16 @@ <h3><a href="#other-connections">Which additional connections can the OS make
configuration. GrapheneOS upgrades the Broadcom SUPL implementation to only
using TLSv1.2 instead of using TLSv1.1 and older with TLSv1.2 disabled.</p>

<p>MMS, RCS, SMS over LTE, VVM (Visual Voicemail), VoLTE (carrier-based calls
<p>Connections made to the IP Multimedia Subsystem (IMS), for services such as
RCS, SMS over LTE, VVM (Visual Voicemail), VoLTE (carrier-based calls
on 4G and higher), VoNR (5G) and VoWi-Fi are largely implemented by the OS via
TCP/IP rather than by the cellular layer itself. This means there will be
connections by the OS to carrier servers instead of being handled by cellular.
GrapheneOS modifies carrier configuration so that toggles for disabling VoLTE,
VoNR and VoWi-Fi are always available. We plan to provide more toggles to
control these things in the future beyond making all the standard toggles
available.</p>
available. This involves connections to the <code>3gppnetwork.org</code>
domains.</p>
</article>

<article id="privacy-policy">
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