Imported Segment - Validating and updating phone numbers in csv for Amazon Pinpoint

New user, working through Pinpoint via console. Creating a segment by uploading csv file. I wish to accomplish two things:

1. Validate existing phone numbers to distinguish landline from mobile
2. implement this use case referred to in AWS intro doc but no follow-up section: Cleansing your existing contact database – If you have a database of customer phone numbers, you can validate each phone number, and then update your database based on your findings. For example, if you find endpoints with phone numbers that aren't capable of receiving SMS messages, you can change the ChannelType property for the endpoint from SMS to VOICE.

Most appreciated in advance . . .