When you run SMS campaigns, sales outreach, or customer support, identifying the phone number type can make all the difference. Many businesses overlook this step. They build solid SMS campaigns with sharp copy and great offers, hit the send button, but don’t get the expected results because SMS doesn’t work on landline numbers, and their CRM is full of landline numbers. That’s why learning how to identify mobile vs. landline number types in your CRM is essential.

This article explains how to accurately detect phone number line types, why it is important, and how you can fix it. Let’s dig into it.

TL;DR

• All phone numbers in your CRM are not the same. Landline numbers can’t receive SMS, while mobile numbers can.
• If you don’t filter them, your SMS campaign will fail, and you will waste money.
• Use a carrier lookup or phone number validation tool like Landline Remover to identify phone numbers accurately.
• Don’t rely on the number format alone; instead, regularly clean your database.
• Focus only on mobile numbers for messaging to improve delivery rates and ROI.

Why Identifying Phone Number Type Matters

Having bad data in your CRM doesn’t show up on your balance sheet, but it does show up in dashboards, the sales funnel, and forecasts.

As per the Gartner study, poor data quality can cost organizations an average of $12.9 million every year.

Even Harvard Business Review digs into it and estimates that bad data drains $3 trillion every year from the US economy.

For businesses, the funnel is where the real value is built. Having bad data can completely disrupt the funnel.

How?

Let me explain to you. 

TOFU (Top of Funnel) – Wrong targeting, overlapping audiences, and incorrect personas lead to a higher cost of acquiring qualified leads.

MOFU (Mid Funnel) – Sales process fails because the system for tracking and organizing potential customers is no longer functional.

BOFU (Bottom of Funnel) – The business model fails because they chase the wrong customers with unsustainable pricing. In other words, the math behind the pricing and customer selection is flawed.

For example:

Assume your CRM has 10,000 contacts, and if 20% of them are landlines, you’re wasting SMS credits, time, campaign performance, and opportunities.

Here is the real impact you’ll experience. 

So, before you send your next SMS campaign, you must identify mobile vs landline numbers.

Mobile Vs Landline Number: What’s The Actual Difference?

Before we dive deep into how to identify phone number types, let’s first understand how mobile and landline numbers differ.

There is also a third type of number: VoIP. These numbers are internet-based and can sometimes receive texts, but they’re unreliable and often fail in business SMS campaigns.

The bottom line is that if you’re running an SMS campaign, the only phone number type you need is mobile numbers.

What is Phone Number Line Type Detection?

At first glance, phone number line type detection sounds technical, but it’s actually simple. Phone number line type detection is the process of determining whether a phone number is mobile, landline, or VoIP. You can do this manually or by using telecom databases, API tools, or carrier lookup systems.

You don’t need to build this yourself; there are phone number validation tools like Landline Remover that can do this.

Here, the question is, how do these landline numbers end up in your CRM?

Let’s find out.

Sometimes businesses import old data from a database or spreadsheet that was never cleaned. Someone may have filled out a form and entered their office or home number.

Business phone numbers are often landlines. A contact might switch from mobile to business landline after joining a new company. And sometimes, due to manual entry mistakes by sales representatives, landline numbers can end up in the CRM.

Now, one question might pop into your mind: What happens if I send an SMS to a landline number?

Read on to get the answer.

What Happens When You Send SMS to Landline Numbers

When you send SMS to landline numbers, the consequence is more than “message doesn’t deliver.”

You waste your hard-earned money

Every SMS credit you spend on sending SMS to a landline number is wasted. You won’t get any return, engagement, or conversion. So, if you’re sending thousands of messages and even a 20% is landline, it means you’re wasting a fifth of your budget.

You waste your time

Your sales team wastes time chasing dead leads, and the marketing team wastes time analyzing campaigns that are not worth your time.

Your legal risk increases

TCPA has strict rules about who you can contact and how. If you send messages to the wrong number types or on the DNC list, it can result in fines up to $1,500 per violation.

Delivery rate decreases

When your SMS campaigns show a high bounce rate, it signals your carrier that your campaigns are of low quality. This damages your sender reputation, which can then affect your ability to reach the valid phone numbers on the list. 

This doesn’t happen with you; that’s why it is essential to identify mobile vs landline numbers in your CRM.

How to Identify Mobile Vs Landline in Your CRM

Here are a few methods that you can use to identify mobile vs landline numbers in your CRM.

1. Manual Checks (We don’t recommend this)

You can search for a number on Google, call it and listen for a dial tone, or try sending an SMS to it and see what happens. This method works but is slow at scale, leads to errors, and is not a practical approach for a CRM with thousands of records. You should avoid using this method if you have thousands of numbers to check.

2. Using Carrier Lookup APIs

It is one of the most accurate methods. Carrier lookup checks for network provider and line type. For that, you need to follow the steps below.

• Upload your contact list
• Run the list through a lookup tool
• Get the line type instantly

You can easily integrate this API into your CRM, web forms, or your SMS marketing platform. That way, every number that enters the system is automatically checked.

The API queries the global telecom database using pattern recognition and signal analysis and accurately classifies each number. It then checks format validity, matches against active carrier records, and gives you the line type in milliseconds. 

3. Using Phone Number Validation Tools

There are phone number validation tools specifically designed to clean your database, remove invalid numbers, and identify phone number types. It usually gives output like valid or invalid, mobile or landline, and country.

One such tool is Landline Remover. Click here to understand how it identifies mobile vs landline numbers in your CRM.

4. Ask Users Directly

This is the simplest method that you can use. On your web form, you can add a simple checkbox: “Is this your mobile number?”

While collecting lead, this method sounds basic, but it improves data quality from day one.

5. Analyze Past Campaign Data

You should look at your past campaign data and analyze which numbers failed. Which numbers never received messages?

The answer will be landlines and invalid numbers.

How Often Should You Clean Your CRM Data

It is a common question, and the answer depends on how quickly your contact list grows.

When you clean your CRM data regularly, it offers you many benefits.

• You will achieve better SMS delivery rates.
• You only pay for messages that reach users.
• Your data becomes more reliable due to a clean CRM.
• With no spammy or failed communication, you will enjoy improved customer experience.

Common Mistakes Businesses Make While Identifying Phone Number Types

Every business that is aware of the landline issue usually makes the following mistake.

• They trust the format alone. Sometimes a number that has the correct length and country code can still be a landline. Format validation only checks for structure, not line type.
• They don’t consider ported numbers. People port their numbers from landline to mobile or vice versa. This means you need to do a real-time carrier data check, not just a one-time check.
• VoIP numbers are easy to overlook. They look like regular mobile numbers but behave unreliably in SMS campaigns. Always identify VoIP numbers separately.
• CRM data becomes outdated constantly. Doing validation once is not the right strategy. Regular revalidation is necessary.
• They validate old data but forget new leads. Sometimes teams validate existing records but forget to validate new leads coming in through forms or imports.

How Can Landline Remover Help?

If you don’t want to make the mistakes discussed above and are looking for the fastest and simplest way to increase your ROI by filtering out landline numbers, Landline Remover can help.

It gives you real-time phone number line type detection that identifies whether the number is mobile, landline, or VoIP. You can validate numbers one at a time, run bulk cleanups, or integrate them via API directly into your CRM, lead forms, or SMS marketing platform so the validation occurs automatically.

Landline Remover not only identifies mobile vs landline numbers but also flags DNC-registered numbers, known litigators, carrier details for routing optimization, and disconnected or inactive lines.

Thousands of marketing teams and lead generation agencies are using it to get clean data without spending hours on manual work. Whether you’re managing 500 or 500,000 contacts, this tool scales as your business grows.

Run Optimized SMS Campaign With Landline Remover

It is important to identify mobile vs landline numbers in your CRM if you prioritize client communication and SMS marketing. It will not only help you save money but also enable you to reach the right people, improve performance, and build trust. 

If you want to achieve all of this without any technical headache, tools like Landline Remover can help you quickly clean CRM data and focus only on data that matters. Landline Remover performs phone number line type detection and combines it with engagement data and purchase behavior. It will help you target smarter.