Open SMS → Contacts, create a group with a name that explains its source and purpose, then continue to the upload flow.
Choose the CSV file and map the phone field first. Confirm country-code formatting and map only the additional columns the team understands.
Large imports continue as background work. Keep the group in review until processing finishes, then open the preview and filter records by validation status.
Correct or remove invalid rows instead of forcing uncertain numbers into a campaign. Check the final count against the source and investigate unexpected duplicates or missing contacts.
Review marketing opt-out status before the group is used. Provider opt-out data can also be synchronized where the connected integration supports it. An updated import must not silently turn an opted-out recipient back into an eligible marketing contact.
