Deletion protection
When you turn on deletion protection you will not be able to delete the pool until deletion protection is disabled. By default deletion protection is disabled.
Enable deletion protection (Console)
Open the AWS End User Messaging SMS console at https://console.aws.amazon.com/sms-voice/
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In the navigation pane, under Configurations, choose Phone pools.
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On the Phone Pools page, choose the phone pool that will have deletion enabled.
On the Deletion protection tab, choose Edit settings.
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Choose Enable deletion protection and then Save changes.