Go to Audiences → Contacts import → Create import → Create import
Give your import a name and select Next
Download the excel template
4. Fill out the excel sheet with the contacts’ phone numbers with country codes or email IDs along with the date of birth
5. Drag and drop or click to add the filed out file. Select Next
6. Assign opt-ins, add to contact list or add tags (if required). Select Next
7. Select Process import 🚀 to finish the import