I tried to eliminate SMS from the “all sent” list, two strange behaviors happened:
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Multiple address for SMS does not get deleted, all but one, that is, if there are 7 sms, then after deleting 6 show up.
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It seems you can only delete one page at the time, that could make it difficult if there are a lot of pages.
This probably happens in other places like contacts, but I haven’t tested yet.