You can upload a number of contacts or manually create contacts on SMS.to and organize them in lists and later use them as recipients of your messages/campaigns.
One contact can be on one or more lists and you can send messages/campaigns to one or several lists at the same time.
The system will always make sure that on phone number will only receive one message per campaign - even if you are sending to several lists and some of the phone numbers are on more than one of those lists. Duplicates will be eliminated on-the-fly in this case.
A good practice is for example to segment your customer database by country into a dedicated contact list for each country. But you can of course use these features for whatever segmentation is best for your specific use case.
If you have any questions, please send us an email at firstname.lastname@example.org