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You can activate the "Input Mask" so that only numbers will be allowed in the Phone Number field.
Just select the Phone Number field and then click the "Input Mask" button at the toolbar.
Hope that helps. Thank you.
I shall stick to the default "Phone Number' setting (which does not prevent the capturing of letters) because the Input Mask option does not yield a visual result that is consistent with the way phone numbers are usually populated in South Africa.
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