There are several reasons why text messages don’t get delivered. An invalid phone number is one of the main causes. By using our free carrier lookup tool, you can eliminate incorrect or non-existent phone numbers from your database to ensure you only call or send mass messages to valid numbers. This has a direct impact on lowering your SMS messaging costs and saves you time and resources too. We recommend you use the carrier lookup tool each time you add phone numbers to your database and before you launch an SMS campaign.