Implement a delete all button for Personal Contacts
If a user imports their entire personal contact directory and then later you would like to clear the personal directory out (in case you want to transfer the number/account to a different user for example), it is not possible to simply delete the entire list or to even select more than one contact at once (on desktop or mobile!)

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Josh commented
Yeah, we need this urgently to resolve an issue.
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Ralph commented
For accounts that have more than 200 contacts, it is best to have a Mark All option wherein we can Put a Mark on All Contacts and delete it in one click without having the trouble of going to each contact page to delete.
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Sara commented
Let us delete more than one text message at a time. You should be able to select a bulk amount of numbers to delete at once instead of going through to delete each individual number.