I'm looking for a MobileConnect version of LogUnsubEvent where you can unsubscribe a contact at the All Subscriber level -- or in MobileConnect terms: All Contacts.
My current options I see are:
Either using QueueMO API and replicate an inbound SMS message to unsubscribe.
Or UpsertDE to a data extension and data extract, file transfer, import into All Contacts.
Is there any other way via AMPscript and UnsubEvent to update MobileConnect subscriber status at the All Contact level?