PHONE, verify a customer phone number

The Data Quality solution to check, in real time, the validity of landline and mobile phone numbers at customer data collection points.

SOLUTION

How to verify a phone number ?

Our PHONE solution enables you to check the existence of domestic or international phone numbers, landline or mobile, in real time at all customer data touchpoints.

To verify customer phone numbers already stored, our secure database processing programs can perform regular or one-off batch processing.

The PHONE solution incorporates several levels of verification and validation optimizing the collection of quality data to improve contact success rates.

Features

Verification of landline and mobile numbers

Verification of the existence of the landline or mobile number with domestic and international operators.

Validation of phone number syntax, formatting and prefix according to  country.

Detection and exclusion of phone numbers not listed with domestic and international operators.

Indicates whether the phone line has recently been active or not.

USE CASE

Why check and verify customer phone numbers?

All the benefits of verifying and validating customer phone numbers

Increased success rate

Optimization of text message campaign delivery rates and increase in the amount of completed calls.

Customer relationship

Improve customer relationships and satisfaction by keeping them easily informed throughout their buying journey.

Cost reduction

Lower costs due to stopped calls or text messages sent to invalid numbers.

Time saving

Reduction in the time teams spend calling invalid numbers.

DQE ''multi-operator'' technology

Validating phone numbers is complex. It is dependent on the policy adopted by every operator, in every country. DQE’s “multi-operator” technology ensures we are always able to validate the existence of a phone number, thanks to our partnerships with relevant operators.

Check your customers' phone numbers

Reachability, successful calls, efficient service: verified phone numbers add exponential value to your contact lists

Verified phone numbers are key pieces of information

The verification of landline or cell phone numbers allows for the correction of erroneous numbers. Trustworthy data validated by syntax correction and landline verification provides a greater chance of successful phone contact. Reduce the amount of time your teams spend searching for numbers, dialing the wrong contacts, or otherwise wasting their time with unverified numbers. The certainty of being able to reach customers on their phone line generates efficiencies, greater success for customer and marketing teams, and optimized customer service.

Marketing with calls and texts: the benefits of verified phone numbers

The confidence generated by mobile number validation also improves the results of text message or phone call marketing campaigns. With validated contact information on mobile and fixed lines checked against phone operators, calls are successful and text messages are delivered to the right cell phone. For marketing teams, this level of data quality creates more opportunities for ROI and overall success. For customers, they can rest assured they’ll get information they need, like verification codes, and want, like discounts or exclusive offers.

Phone number check, a plus for the customer experience

Customers are most often asked to provide their phone number on their journey to receive the customer service they expect. Verification of mobile and telephone numbers contributes to customer satisfaction. Numbers validated with operators and standardized allow key teams to make the right association between number and person. Customers then receive reliable text messages at key stages of registration, confirmation, and delivery. They’ll also benefit from efficient service, like promptly fulfilled callback requests.

FAQ

Validating a phone number involves checking its syntax (correct length and format for the country), confirming the number is assigned to an active operator, and — for mobile numbers — checking whether the line has been recently active. This can be done via operator lookup APIs or dedicated phone validation tools. DQE’s PHONE module performs all these checks in real time against domestic and international operator databases, covering both landlines and mobile numbers.
A format check only verifies that the number is syntactically correct — the right number of digits, a valid country code, a plausible prefix. It cannot confirm whether the number actually exists or is assigned to anyone. An operator lookup goes further: it queries the relevant telecom operator to confirm the number is a real, allocated line. For marketing or customer service use cases, operator-level validation is significantly more reliable.
SMS delivery failures typically stem from invalid or unallocated numbers, numbers that have been ported between operators without correct routing, landline numbers that can’t receive SMS, or numbers that are inactive. Sending to a large proportion of invalid numbers also risks getting your sender ID flagged by operators. Validating mobile numbers before launching an SMS campaign — including checking for recent line activity — directly improves delivery rates and protects your sending reputation.
Number portability allows subscribers to keep their phone number when switching operators. This means the number’s prefix or area code may no longer correspond to its current operator, making simple prefix-based checks unreliable. Proper phone validation tools account for portability by querying real-time operator databases rather than relying on static prefix tables. DQE’s multi-operator technology is designed specifically to handle this complexity across countries.
When a business holds an incorrect or outdated phone number for a customer, that customer may miss delivery notifications, OTP verification codes, appointment reminders, or urgent service alerts. From the business side, call centers waste time on unanswered or misdirected calls, and SMS campaigns fail silently. Verified, up-to-date phone numbers are a prerequisite for any channel where timely, reliable contact matters.

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