Hi @KevinL2573. There isn't a way for our system to determine the type of phone number that was uploaded previously or what the current status is.
The best way to collect mobile phone numbers would be to create a landing page that includes an SMS opt-in field. If a contact is interested in receiving SMS marketing from you, they can complete the form to include their phone number and ensure the message is going to the correct number. This will help your reporting as well since it will lower the chances of seeing bounced messages after a campaign is sent.
We have a specially designed template that can be used to invite your current contacts to opt-in to SMS campaigns.
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