When a mobile handset switches networks, the network operator updates its HLR (Home Location Register) database to keep track of which Mobile Switching Centre it is currently serviced by. This information enables aggregators and call services to route calls to the correct network, ensuring the best possible roaming experience for the subscriber.

By performing an HLR phone number lookup  before calling, companies can reduce the cost of their SMS and voice campaigns by identifying which numbers are valid and reachable. This also allows them to improve their response rate by removing inactive or unanswered numbers from their databases. In addition, it can help them comply with data protection regulations by ensuring they don’t reach out to numbers that have been ported or are virtual throwaway numbers.

HLR Lookup Services: How They Work and Why They’re Essential for Mobile Communication

An HLR lookup can be performed on individual numbers or a list of contacts. The check is done in real-time and returns details such as the country code, whether the number is active or not, which network it is connected to and if the subscriber is roaming.

This helps businesses to optimise their SMS messaging processes and can significantly reduce the cost of calls, by directing them via networks with lower fees. It can also improve their customer experience by ensuring that only live and switched on numbers are called, increasing the chances of a sales conversion or call response. Additionally, the service can help them avoid expensive mistakes, such as sending messages to subscribers who are not at home or have changed their phone number.