With the vlemmy situation ongoing, i feel like it would be useful to put this here (i did not make either of these tools)
Lemmy Account Settings Instance Migrator (LASIM) copies all your subscribed communities and blocks and lets you upload them to another account, in just a few clicks
lemmy-migrate does the same thing but without a GUI and support for uploading your backup to multiple accounts at once
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LASIM definitely does not - it’s designed for desktop and written rust, so not easily portable to iOS/Android.
Doesn’t look like lemmy-migrate would either - it’s a python script - unless there’s a mobile python interpreter app or something.
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iOS probably not but I think you could run python stuff in termux for android