Three Levels of Phone Validation: Ensuring Data Accuracy for Better Communication
Phone validation is one of the basic and essential checks businesses do when onboarding customers. Whether you’re trying to reach customers, send marketing messages, or provide customer service, invalid phone numbers can lead to missed opportunities and a direct negative impact on the business. Luckily, a comprehensive phone validation solution offers various layers of protection to help you clean up and validate your phone data. In this post, we’ll explore the three critical levels of phone validation, including:
- Syntax Checks
- Carrier Assignment
- Connected/Disconnected Status
Let’s break down each type of phone validation and how it contributes to better data quality. You can decide the right level of checks to perform and why, depending on your business needs.
Syntax Checks: First Line of Defense
The most basic level of phone validation starts with syntax checks. At this level, the system verifies whether the phone number follows a valid format based on the country or region. For example, U.S. phone numbers follow a specific pattern of digits, including the one-digit country code, three-digit area code, three-digit exchange code, and the subscriber number (e.g., +1 333-555-5555).
What it catches:
- Invalid character types (letters or symbols where there should be numbers)
- Numbers that are too short or too long for their country format
- Incorrect area code formatting
- Missing country codes for international numbers
Syntax checks ensure that the phone number is at least structured correctly, but they don’t confirm if the number is actually valid or in use.
Carrier Assignment: Identifying the Provider
The next level of validation goes beyond simple formatting. Carrier assignment checks help confirm a carrier is assigned to the phone number. This step helps determine whether the phone number is active and in use under a specific mobile or landline carrier.
What it reveals and why it is relevant:
- The network carrier assigned to the phone number (e.g., Verizon, AT&T, T-Mobile) ensures that the number is not only syntax correct but potentially a working number used for communications.
- Type of phone number (mobile, landline, or VoIP) so that businesses can determine if the number works for their workflows. For example, for 2FA authentication, businesses might ask for mobile numbers only as part of the validation check.
- Number portability (whether the number has been transferred to a different carrier) so that businesses know the accurate network carrier who owns the number currently and not based on the original number block assignments done. It is essential that a phone validation provider you choose provides this latest ported data on a phone number; otherwise, the data is just stale, resulting in incorrect business decisions. For example, assuming the number is still a landline based on its original carrier assignment, it might have been ported to a new carrier that is mobile and can accept text messages.
Connected/Disconnected Status: Real-Time Validation
The most in-depth level of phone validation is a real-time status check. This process verifies whether a phone number is currently connected or disconnected. A disconnected phone number means the person no longer uses the line. On the other hand, a connected status indicates that the number is valid and reachable.
This validation layer is critical for businesses that rely on real-time customer engagement. If a phone number is disconnected, it’s a clear signal that the data needs to be updated to maintain communication efforts or, if you were going to contact them, to deprioritize that lead or sign up.
The Benefits of Multi-Level Phone Validation
Businesses can use these three phone validation levels to significantly improve their data accuracy and communication effectiveness. Syntax checks ensure numbers are formatted correctly, carrier assignment adds insight into the number’s type and carrier, and real-time connected status checks ensure the numbers are reachable.
All of these checks help improve delivery rates and build better connections with your audience. By employing a multi-layered approach, businesses can improve data hygiene, reduce operational costs, and ensure communication efforts reach the right people. Depending on the budget and the criticality of phone-based communications, businesses can start with basic syntax checks, move up to carrier assignment, and finish with real-time connection validation.
Trestle offers a robust Phone Validation API to help you validate phone numbers in real time, ensuring you always have accurate, up-to-date information. It includes all three levels of phone validation and even a Phone Activity Score (a scale of 0-100), which tells the activity associated with the phone and can further help prioritize the sign-ups or adjust the customer waterfalls.
If you want to learn more about how Phone Validation API can help your business, check out our API Documentation or contact us for more information.
