Case Study · Phone Verification
Find out how a Spanish ecommerce company reduced the cost of its SMS campaigns by 23% simply by validating its phone database before each send.
Our phone number verification service allows you to detect in real time which numbers are active, which have been ported and which are invalid, before investing in a campaign.
Using the API or bulk file validation, our clients maintain clean databases and SMS campaigns with delivery rates above 98%.
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How an ecommerce company reduced the cost of its SMS campaigns by 23%
Grupo Distribución Directa is a Spanish online sales company of household products with more than 8 years of activity and a database that exceeds 120,000 contacts captured through online stores, social networks and lead capture campaigns.
The SMS channel is one of your main recurring sales engines: abandoned carts, order confirmations, seasonal promotions, and recovery of inactive customers. With open rates above 90%, SMS was strategic, but the results of recent campaigns had worsened for no apparent reason.
- Sector: ecommerce / retail — household products
- Database: +120,000 multichannel contacts
- SMS accounts for 35% of your recurring sales
- Cost per conversion rising quarter over quarter
The problem: money sent to numbers that no longer exist
Grupo Distribución Directa sends mass SMS campaigns several times a month. When analyzing the shipments in detail, they detected that approximately 22% of the numbers in their database generated silent delivery errors: disconnected numbers, ported to another operator without updating, or directly incorrect captured in web forms.
With an average cost of €0.05 per SMS and a base of 120,000 contacts, each mass campaign meant sending about 26,400 messages to invalid numbers: €1,320 wasted per send, not counting the negative impact on the sender’s reputation with operators.
The marketing team couldn’t find the cause: the message was the same, the offers were good, the shipments went out at the right time. The problem was invisible until the quality of the database was audited.
The solution: validate the database before each campaign
Before their next season campaign, they uploaded their entire database to verificaremails.com using MNP validation to identify which numbers were active and which was their current operator. The complete process of the 120,000 numbers took less than 2 hours at a cost of €264.
Analysis results:
- 93,800 valid and active numbers ✓
- 17,200 invalid or disconnected numbers removed
- 9,000 numbers with portability detected and routing corrected
With the clean list, the delivery rate went up from 77% to 98%, the sender’s reputation recovered, and the conversion rate of the campaigns improved by +23%. The net savings in that first shipment was €596 (€1,320 avoided minus €264 validation).
After checking the result, they integrated the validation API into their web registration form. Now each new number is validated in real-time in less than 2 seconds before entering the database.
“We thought the problem was the message or the time of sending. The problem was that almost one in four numbers in our database was wrong. Now we validate at source and the numbers add up.”
— Head of Digital Marketing, Direct Distribution Group
FAQ Validate Phones
The HLR (Home Location Register) validation is the most accurate: it directly checks the operator’s network to confirm if the number is active and connected at that time. The MNP verifies the current operator and detects portability, at a lower cost. The syntactic validates formatting and prefixes without consulting the network. For SMS campaigns we recommend MNP at a minimum, and HLR when accuracy is critical.
Bulk validation per file takes approximately 1-2 hours for 100,000 numbers, depending on the method chosen. Individual validation via API responds in less than 2 seconds per number. You can upload CSV or XLSX files directly from the web panel.
In most cases on the first use. If your database has 15% or more invalid numbers and the cost of your SMS exceeds €0.03, the savings on the first send exceed the cost of validation. A base of 100,000 contacts with 20% invalids means €1,000 wasted per campaign at €0.05/SMS, compared to €220 for MNP validation.
If verification is done via API, we do not store any contact data. For file validations, the data is stored encrypted on servers in the European Union following the GDPR regulations, and is only accessible by the account holder with access credentials.
Yes. For mobile numbers, the accuracy is 100% since we consult the operators’ network directly. For fixed numbers we also carry out verification, with reliability levels that depend on the country and the operator that manages the number.
Databases degrade by approximately 20-30% per year: numbers that are deregistered, ported, or logged with errors. For databases with more than 500,000 contacts, we recommend quarterly validation. For smaller bases, before each massive campaign is sufficient. With API integration into forms, the foundation is kept clean from the source.
We have native integration with Zapier and N8N to connect to any CRM, shipping platform, or tool without the need for programming. For custom integrations, the REST API is documented with sandbox. We also have a widget to validate in web forms by simply pasting a code.
Depending on the method chosen, you get: number status (valid/invalid/disconnected), current operator, portability detection, IMSI code, type of line (mobile/landline), country and geographical area, and recent connection indicator in the last 24h (HLR only). All this information is returned in JSON format in less than 2 seconds.
How much are you spending on invalid phone numbers?
Upload your file and in less than 2 hours you will know exactly how many numbers in your database are valid and how much you can save.
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