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Mobile validation API

Mobile phone number validation

Postcoder checks and validates mobile phone numbers in real-time as soon as they're typed into your form. Reduce fraudulent or incorrect signups, and collect valid and active mobile phone numbers from genuine customers.

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Mobile phone number validation
    • Result Valid mobile phone number
    • Valid
    • On
    • Network UK - VODAFONE
    • Country United Kingdom
    • Mobile number 00447500123456
    • State Number is valid and on
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Globally-connected

Mobile validation API

Postcoder mobile validation queries the Home Location Register (HLR) databases of global network providers in real time to confirm if a number is active, assigned and reachable via call or SMS.

  • Validates in real time
  • Standardises the mobile phone number
  • Provides the carrier name and country
  • Confirms on/off status
  • Supports all countries
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GET /pcw/PCW45-12345-12345-1234X/mobile/07500%20123456?format=json
----
{
	"stateid": 1,
    "state": "Number is valid and on.",
    "on": true,
    "valid": true,
    "number": "00447500123456",
    "type": "MOBILE",
    "networkname": "UK - 02 (UK) Limited",
    "networkcode": "10",
    "countrycode": "234",
    "countryname": "United Kingdom of Great Britain and Northern Ireland"
}
Checkout
Please provide your mobile so we can keep you updated on your delivery
Mobile number
07500 123456
Continue

"60% of consumers intentionally provide incorrect information when submitting their details online."

Source: Verve Research
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Validate, clean, connect

Unlock efficiency with Postcoder mobile validation

  • Validate phone numbers in real-time

    Postcoder instantly checks if international mobile phone numbers are real and active.

    {
	...
	"valid": true,
	"number": "00447500123456",
	...
}

  • Capture actionable insights

    Postcoder identifies recently active mobile numbers, so your calls and SMS reach real users at the right time.

    {
	...
	"state": "Number is valid but not on.",
	"on": false,
	"valid": true,
	...
}

  • Standardise international numbers

    Postcoder standardises international mobile numbers into a consistent format and returns network provider details.

    Mobile number
    07500 123 456
    {
	...
	"number": "00447500123456",
	"networkname": "UK - VODAFONE",
	"networkcode": "15",
	"countrycode": "234",
	...
}
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Elevate customer experiences

Enhance your customer relationships with mobile validation

  • Reduce bogus accounts

    Prevent fake, inaccurate or dead mobile phone numbers from being used to create bogus accounts.

  • Improve call centre efficiency

    Save time and money by verifying a mobile phone number is active and switched on before trying to call it.

  • Optimise two-factor auth

    Reduce the risk of your customer waiting for a code that never arrives by validating their mobile number first.

  • Minimise funnel leaks

    Avoid losing leads or customers at registration due to accidental typos in their mobile phone number.

  • Stay connected

    Increase the effectiveness of your SMS campaigns by ensuring your customers get the texts they want from you.

  • Enhance data quality

    Standardise mobile phone numbers by automatically removing unnecessary characters like spaces and brackets.

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Always on

Everything your business needs

Postcoder and its team of address and technology specialists meet the needs of high-demand applications and rapidly growing businesses.

  • ISO 9001 certified

    Built on quality management best practices you can trust.

  • Auto-scaling infrastructure

    Seamlessly handles enterprise volumes and traffic spikes.

  • PCI-DSS & GDPR compliant

    Designed for secure, privacy-first data handling.

  • 99.99%+ uptime

    Proven reliability to keep your integrations running smoothly.

  • 24/7 internal response team

    Our engineers are on standby 24/7 to respond to service disruptions.

  • Low-latency response times

    Fast, reliable API performance at all times, even under load.

  • Full API access & integrations

    Connect easily with your existing tech stack.

  • Truly global coverage

    Real-time mobile number validation with carrier, status and reachability checks across all countries.

  • Dedicated onboarding specialist

    Personalised setup and best-practice guidance.

  • Migration assistance included

    Smooth transition from legacy systems or providers.

  • Free multi-channel support

    Get help via chat, email or phone - at no extra cost.

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Highly rated by customers

Award-winning with top performance, easy admin and great support

Businesses rate Postcoder 4.7 stars out of 5 on the world's most trusted software marketplace.

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  • "Having a more simplified checkout page with the help of Postcoder has had two major benefits to our business. Faster checkouts by customers who haven't had to type in their full address, a much simpler customer journey and a major reduction in data errors; where we saw a big drop in incorrect details entered."
    Alex Woods Digital Marketing Executive / Victorian Plumbing
  • "We picked Postcoder because the API is simple to use and it supports many countries which we want to scale out to."
    David Annez Head of Engineering / loveholidays
  • "The reason we like Postcoder is that the rooftop lat/long coordinates have proven to be far more accurate than any other service and Postcoder has hugely increased our successful delivery rates."
    Laura Bailey E-commerce Product Manager / Pasta Evangelists
  • "Postcoder offers a seamless integration with our services. It is very popular with our customers."
    James Gutterson Commercial Manager / Signicat
  • "Postcoder has been great; there has been a noticeable quality increase in our campaigns. In some the pickup rate went from 30% to 60-70% and our appointment ratings for a campaign went from a 15% average to 40% for one client!"
    Daniel Jones IT Technician / Lead Pronto
  • "Postcoder is a single API that provides all the features we need... Rather than integrate several APIs, we only had to integrate one."
    Carl Horn Head of Digital Servicing & Customer Transformation / Capquest
  • "Postcoder ensures that all the address data, the mobile number and the email addresses that our customers give us are correct. It really speeds up the process for our customers."
    Julie Taylor Operations Director / Barrhead Travel