When Mullvad creates the android / iOS version of Mullvad Browser?
Possibly never (but never say never).
To understand why it is useful to understand two things about Mullvad Browser:
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The most important and impactful contribution makes to the private browser space is fingerprinting resistance. This depends very heavily on two factors (1) having the technical capabilities to defend against browser fingerprinting, (2) a large enough userbase of difficult to distinguish users that is sufficient enough to create ‘crowds to blend in with’. An Android user, an iOS user, and a desktop user most likely cannot blend in with one another. This isn’t necessarily an issue if each OS had sufficient users to ‘create crowds’.
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Mullvad Browser is downstream or the Tor Browser (which in turn is downstream of Firefox) and Mullvad was developed in partnership with the Tor Project. For this reason, most major things the Tor Browser does or does not do are inherited by Mullvad Browser. As it stands right now, Tor Browser is available for Desktop as well as Android, there is no iOS equivalent (probably because all iOS browsers must currently be based off of Safari and Safari’s browser engine under the hood). Until Tor Browser is available on iOS, which probably won’t happen unless/until iOS is opened up to other browsers/browser engines I would be extremely surprised to see Mullvad Browser support iOS. And on Android, Firefox exists, but it has a really tiny marketshare compared to Chrome+Chromium derivatives, and has some catching up to do in terms of security (on Android), so the cost/benefit makes it unlikely I think.
Actually there are several Tor Browser/VPN/Onion apps in the Apple Store. Now whether they are true Tor Browsers I’m not sure but they represent themselves as if they are. I have used the top 3 most downloaded versions and it seems to be working as Tor is supposed to but I’m far from an expert.