Landline validator is a service that checks whether a phone number belongs to a landline or a mobile/cellular device. It also verifies if it’s active or disconnected. This service is used by marketers and businesses that want to ensure that they’re only contacting customers who can be reached at the given number. In the past, many people were able to tell whether a phone number was cell or landline by looking at its prefix. However, as phone numbers are ported from one network to another and people switch between cell and landline carriers, distinguishing them solely by the number’s prefix is no longer a reliable method.

There are a number of tools and services that can verify whether a phone number is a landline or a mobile/cellular. They can be integrated into your websites, apps, and CRM. Some of them even offer a live ping to the number and a list of the carrier and line type. Some of these tools are free while others have a monthly subscription fee.

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Using a landline validator is a convenient way to keep your customer database updated and prevent delivery errors when running SMS or voice-based marketing campaigns. It can help you identify which type of carrier network your customers are on and optimize SMS routing for them.