When a company needs to validate mobile numbers before launching a campaign, activating an account, or cleaning up their CRM, the question usually arises quickly: where can I hire a truly reliable mobile number validation API?
Because today it is not enough to know if a number “has the right format”. In practice, what matters is whether it is active, which operator manages it, whether it has been ported or even whether it has real coverage. A poorly validated number can result in unnecessary costs, blockages in campaigns or leads that will never respond.
In this article we are going to see how an API works to verify phone numbers, what technologies exist (HLR, MNP and syntactic validation), how to easily integrate it with tools such as n8n or Zapier and why the HLR Lookup Plus system developed by VerifyEmails provides an additional level of accuracy.
What should a mobile number validation API have?
If we take it easy, not all APIs offer the same level of depth. Some only check the format. Others promise “advanced” validation but don’t detail what kind of testing they actually perform.
Before choosing a solution, it is worth looking at several key points:
- Real accuracy in mobile numbers.
- Ability to differentiate between fixed and mobile.
- Portability Information (MNP).
- Bulk verification when working with large bases.
- Easy integration via APIs, webhooks or no-code tools.
- Regulatory compliance (GDPR).
There are many options on the market, but few platforms integrate all validation methods into a single technical environment. In VerificarEmails.com, for example, syntactic validation, MNP, HLR and the exclusive HLR Lookup Plus are combined. This allows you to adjust the level of verification according to the context: marketing campaigns, onboarding processes, fraud prevention or database cleansing.
How the API works technically
Full technical documentation is available at: 👉 https://www.verificaremails.com/docs/index_telefonos.html
From a technical point of view, the API works using HTTP REST requests. It is a simple system for developers, but powerful in results.
The usual flow would look something like this:
- Your system sends the number in international format.
- The engine analyzes prefix and country.
- The selected validation type (Syntactic, MNP, HHR, or HLR Plus) is executed.
- A structured response is returned in JSON.
A simplified example of an answer could be:
{
"number": "+34600123456",
"valid": true,
"type": "mobile",
"operator": "Movistar",
"ported": false,
"status": "active"
}
Depending on the service contracted, the answer may include:
- Type of line (fixed or mobile).
- Current operator.
- Portability information.
- Activity status.
- Additional risk indicators.
In practice, this allows the mobile number validation API to be integrated into very different environments: own backends, CRMs, eCommerce, SaaS platforms or automation systems.
In addition, the architecture is prepared for both individual validation in real time and for mass verification through files or automations with webhooks.
Available Verification Types
The different levels of validation are explained in https://www.verificaremails.com/validar-numeros-telefono/ .
Syntactic validation
It is the first filter and, although simple, it is essential.
Check that:
- The format is correct.
- The length is consistent.
- The prefix corresponds to the country indicated.
It does not confirm whether the number is active, but it avoids basic errors in forms and reduces data misentered from the source.
MNP (Mobile Number Portability) Verification
Here we enter a more practical level.
MNP verification allows you to know if the number has been ported and who your current carrier is. This is especially relevant when you need:
- Route SMS correctly.
- Segment campaigns by operator.
- Optimize telecommunications costs.
In many business scenarios, this makes all the difference.
HLR Verification
The HLR (Home Location Register) directly queries the operator’s network to determine if the mobile number is active.
In practice, this makes it possible to:
- Confirm that the mobile phone really exists.
- Detect decommissioned lines.
- Reduce bounces in SMS or WhatsApp campaigns.
It is one of the most accurate methods for validating mobiles and is widely used in industries where reliability is critical.
HLR Lookup Plus: Beyond the Traditional HLR
The HLR Lookup Plus system doesn’t just confirm if the number is active. Analyzes additional parameters related to coverage and actual line status.
In practice, this makes it possible to detect situations such as:
- Technically active numbers but without operational coverage.
- Anomalous behavior on the network.
- Lines that can generate incidents in critical campaigns.
It’s an additional layer of intelligence not typically found in standard APIs and is especially useful in high-volume or high-risk contexts.
Integration with n8n
For those working with advanced automation, there is a specific node:
👉 https://www.verificaremails.com/nodo-n8n-validacion-datos/
This allows validation to be incorporated into automatic flows. For example:
- Web Form
- N8n receives the lead
- Check the API
If the number is active → is sent to sales
If it →’t automatically discarded
This type of integration reduces business costs and improves pipeline quality without manual intervention.
Zapier integration
For more SaaS-oriented environments or non-technical teams:
👉 https://www.verificaremails.com/servicio-verificar-emails/como-utilizar-zapier-verificar-emails/
Zapier allows you to connect validation with tools such as HubSpot, Salesforce, Google Sheets, or Shopify.
The flow is simple:
- A new record is generated.
- Zapier queries the API.
- The status of the number is updated.
- Automation continues (or stops) depending on the outcome.
No programming required and with configuration in a few minutes.
Widget for Form Validation
Another interesting alternative is to validate directly on the frontend:
👉 https://www.verificaremails.com/kb/como-utilizar-el-widget-para-validar-formularios/
The widget allows you to verify the number while the user enters it. This reduces errors from the outset and improves the quality of the data entering the system.
It is especially useful in:
- Landing pages.
- Registration forms.
- eCommerce.
- Requests for quotations.
It integrates with a small JavaScript script and can be adapted to the design of the site.
So, where to hire a reliable API?
If you need an API to verify phone numbers that combines:
- Syntactic validation.
- MNP.
- HLR.
- HLR Lookup Plus.
- Integrations with n8n and Zapier.
- Widget for forms.
- Mass validation by file.
The most efficient thing to do is to choose a platform that centralizes all these services in the same technical environment.
VerificarEmails not only offers the API, but also a dashboard with statistics, flexible credit model, clear documentation and specialized support. This facilitates both business projects and complex integrations in marketing, telecommunications or fintech. If you want, in the next step I can prepare you:
- The optimized meta description.
- The recommended SEO slug.
- Proposal for strategic internal links.
- Version even more oriented to B2B transactional intent.
The most efficient thing to do is to choose a platform that centralizes all these services in the same technical environment.
VerificarEmails not only offers the API, but also a dashboard with statistics, flexible credit model, clear documentation and specialized support. This facilitates both business projects and complex integrations in marketing, telecommunications or fintech.
