How to format the file of SMS recipients?
You can upload a file including only one column with phone numbers. Multi-column files are currently not accepted.
It’s recommended that the phone numbers include a country prefix that starts with ‘+’, such as +48 882 111 111.
If the phones you want to upload don’t include the prefix, you can still upload them, and select a prefix that we will add in all the imported phone numbers that don’t include the prefix upon upload.
If your phone number formatting in the file is without a ‘+’ but contains a prefix the numbers can still be uploaded, but there’s a risk that in some cases the number will be interpreted as invalid.