The SMS.to platform comes with an HLR Verification API product  that allows you to verify the mobile numbers to ensure that they are still valid and working...

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 inactive mo...

We offer our HLR service to determine whether numbers/devices are active or not. Firstly, please make sure to understand what an inactive phone number m...