How do I import email, SMS, WhatsApp, and Viber contacts from one CSV file?

Use Audience → Import CSV → Import Contacts. One file registers contacts for every channel, and one phone number column can register a contact for SMS, WhatsApp, and Viber at once.

Prepare the file:

• Header row first, comma-separated, UTF-8, up to 100 MB.
• Include an email column, a phone number column, or both. Phone numbers must be in international format with + and the country code, without a whatsapp: or viber: prefix.
• A User ID column is optional but recommended, so a contact's channels share one user profile.

Then click Upload CSV, enter a Segment name, and under Contact column in CSV pick a column and its Channel. Click + Add channel to map the same column to another channel. Map extra columns to tags if needed and click Start Import.

If a row can't be parsed, the whole file is rejected at upload and a toast names the row, so fix it and upload again.

After the import, the completion screen shows Created and Updated channel registrations and groups skipped rows by reason, such as Email address is not valid, Disposable email address, or Phone number is not valid. Click Download skipped rows to get those rows with the reason added, fix them, and re-upload. Download the file before you leave the screen.

Learn more: Import contacts