Before you send your SMS campaigns, we highly recommend you run the HLR clean-up first. This is to ensure that you are not sending to invalid or non-working mobile numbers. Cleaning your list of contacts allows you to save money and time before running your SMS campaigns. 


Learn how to use the HLR feature from this link. When you're done uploading your list of contact for verification, you can download the report. Remove the invalid mobile numbers then import your list of contacts before sending your SMS campaigns. 



1. In your SMS.to dashboard, click HLR Number Lookup. Then click Reports. 



2. Choose between downloading an excel file or .csv. 



3. When you're done downloading, review the list of verified numbers and remove or delete the ones that are marked invalid or non-working mobile numbers. 


Learn how to import your list of contacts here. Start sending your SMS campaigns after ensuring your contact list is clean. 




If you have any questions, please send us an email at support@sms.to