Using the HLR Lookup location to clean your database and boost performance
The HLR (Home Location Register) is a set of databases maintained by MNOs that contain all the mobile phone numbers across the world. You can access these databases through one single point of entry using the CLX HLR product.
A HLR lookup will give you information on the numbers you hold in your database – whether or not the number is correct, if it is active, which network it is on and whether or not the number is roaming. Checking these things on a HLR lookup means that you are only contacting active numbers and so will only be charged for messages that are received, plus you can also take people off the list who are roaming, so that they are not charged for receiving messages whilst abroad, potentially causing annoyance.