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Does android or or iOS support the update url (and actually check for updates) as part of the vCard as a mechanism to stay up to date.

Could you share what's the property name for the update url?

It's "SOURCE"

But does android or iOS support it and actually check for updates regularly?

To answer myself: I doubt it.

The SOURCE property is optional and apparently more aspirational than real.

That's a damn shame. I think that having it update regularly means you can keep in contact if the situation changes.