Your weapons to protect your data

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This first method involves making an automated voice call to a given phone number. The recipient receives an automated call with a pre-recorded message containing a specific code or instruction .

To confirm the validity of the number, the user must enter the code received by phone.

Although this method is relatively simple, it has drawbacks such as the need for direct interaction with the user , which can be perceived as intrusive, as well as potential costs related to automated calls . Its use is, however, limited.

It is mostly used in cases where the validity of a phone number needs to be quickly confirmed. Here are contact numbers list some of the common situations where this method is implemented:

when registering and authenticating users of an application or online service;
at the time of a financial transaction, particularly when it is necessary to authorize a so-called “delicate” operation;
in emergency situations , for example, when a location needs to be confirmed to emergency services.
SMS verification
With this alternative means of validation, a verification code is sent to the relevant phone number as an SMS. The user must then enter this code to validate the mobile phone number.

This is a more popular method than automated voice calling, as many people are comfortable using SMS.

Again, this solution is used in many situations by different companies:

Several online services allow users to reset their password using SMS verification;
SMS verification is also often used to set up two-factor authentication (2FA) when logging into an account. After entering their password, users receive a verification code via SMS that they must enter to access their account;
In e-commerce, this method can be used to confirm purchases of products or services online using a code to complete a transaction.
While this solution has fewer limitations than call verification, it is not possible to verify the phone numbers in your contact list before sending an SMS campaign...

HLR verification
The HLR (Home Location Register) Lookup tool is recognized as the most advanced and effective method of phone number verification. It offers a comprehensive analysis, far beyond simply confirming the validity of the number .

When a number is submitted for an HLR Lookup, it is verified in real-time using an API against the mobile operator's central database.


This allows you to instantly detect whether the number is still valid and whether it is still assigned to an individual.

Here are some examples of HLR usage:

Database cleaning . In fact, it can identify and remove invalid numbers, inactive numbers, duplicates or even incorrect numbers. This leads to an improvement in data quality and reduces errors related to information problems;
Optimizing SMS marketing campaigns by targeting only potential customers, this leads to a better conversion rate and reduces the costs of sending unnecessary SMS;
for sending SMS alerts . A government, for example, can verify with the HLR that the telephone number used to communicate the information is valid and accessible.
HLR Lookup is therefore the preferred solution for companies that want to have a database with as few errors as possible and who want to communicate effectively with their customers .

If this method has piqued your curiosity , dive right now into the world of our great service, HLR Lookup !

Dive into the world of HLR Lookup
At SMSFactor, we offer you to use HLR Lookup to update your customer databases and send more effective SMS campaigns! Here are two different ways.

Update your database with SMSFactor
Cleaning a database is essential to maintain the quality of your contacts. Our SMS API gives you the option to integrate database cleaning via HLR Lookup into your software . This can lead to a guarantee that your phone numbers are up to date and valid, reducing costs and errors related to unusable numbers.

The HLR Lookup is a very interesting tool to keep a good database and improve the effectiveness of your communication campaigns!