Ben Hardill<p>Given the recent story about <a href="https://bluetoot.hardill.me.uk/tags/O2" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>O2</span></a> leaking location information with <a href="https://bluetoot.hardill.me.uk/tags/VoWiFi" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>VoWiFi</span></a> <a href="https://bluetoot.hardill.me.uk/tags/VoLTE" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>VoLTE</span></a> </p><p><a href="https://mastdatabase.co.uk/blog/2025/05/o2-expose-customer-location-call-4g/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">mastdatabase.co.uk/blog/2025/0</span><span class="invisible">5/o2-expose-customer-location-call-4g/</span></a></p><p>I wonder if <span class="h-card" translate="no"><a href="https://fosstodon.org/@osmocom" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>osmocom</span></a></span>'s project to run VoWiFi with Asterisk and a SIM reader makes this all a lot easier, given you don't need a rooted phone any more.</p><p><a href="https://osmocom.org/projects/foss-ims-client/wiki/VoWiFi_with_Asterisk" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">osmocom.org/projects/foss-ims-</span><span class="invisible">client/wiki/VoWiFi_with_Asterisk</span></a></p><p>I've been trying to get it to work on GiffGaff which is a UK O2 Owned/Operated MVO so I'm guessing uses a lot of the same infrastructure.</p><p>I haven't got it to work just yet but I'm close.</p>