Blog / Guide

Changing your WhatsApp number without losing chats and contacts

You've changed carrier, switched to a business SIM, or you want to separate your personal number from your work one: in all these cases you're not forced to create a WhatsApp account from scratch. WhatsApp includes a dedicated feature, "Change number", that moves your entire account to the new number, bringing along chats, groups, profile photo and settings. The real risk isn't losing messages, but making the switch in the wrong order and ending up with contacts who keep writing to your old number.

In this guide we'll go over the exact steps of the procedure, what really happens to chats and groups, the difference with WhatsApp Business and, above all, what a business has to do when the changed number is the one used for support and marketing. Because on the personal side a few taps are enough, but on the business side a number is also an asset published on a website, business cards and campaigns.

What the "Change number" feature really does

"Change number" doesn't create a second account: it transfers the existing one from one number to another. That means the new number inherits the chat history on the phone, the account settings, the profile photo and the status. It's designed exactly for those who keep the same phone but change the SIM card, or for those who keep the device and migrate to a different number.

One point to clarify right away: the transfer concerns the account and the data on the device, it doesn't automatically move anything on other people's phones. Your contacts still have the old number saved in their address book, so they need to update it to find you with the right name. WhatsApp helps by offering the option to notify your contacts of the change, but they update their own address books themselves.

Before you start: the requirements

Changing the number requires both numbers to be manageable by you at the moment of the switch. Skip one of these points and the procedure can get stuck on verification.

• The new number must be active and able to receive an SMS or a verification call, because WhatsApp sends a code to that number
• It's best to keep the old SIM available: in some cases you need to confirm your identity on the starting number
• Make a recent backup of your chats (to Google Drive on Android, to iCloud on iPhone) before touching anything
• Make sure you have a stable connection: the transfer and verification go through the internet
• Update WhatsApp to the latest version to avoid screens different from those described

If the new number is the one you use to manage customers, before the change export or note down your list of important contacts and groups. On SendApp your contacts and conversations stay in your platform account regardless of the phone's number: once the channel is reconnected, you find everything there without depending on the device's address book.

How to change your number on WhatsApp step by step

The procedure is the same on Android and iPhone, only a few labels change. Follow the steps in order, without skipping the final confirmation.

1. Open Settings and find the feature

Open WhatsApp, go to Settings, then to Account. Inside you'll find the "Change number" item. Tap it and read the intro screen, which reminds you of what you're about to do: you'll be asked for both your current number and the new one.

2. Enter the old and new number

On the first line enter the number currently associated with the account, including the international prefix. On the second line enter the new number, also with the prefix. Check the digits carefully: a mistake here is the most common cause of blocks during verification. Then confirm to continue.

3. Choose whether to notify your contacts

WhatsApp offers to notify your contacts of the change. You can notify everyone, only the contacts you have open chats with, or only selected people. For a business number it's best to notify at least those with active conversations, so customers know where to write to you. For a personal number you can also choose whoever you like.

4. Verify the new number

WhatsApp sends a verification code to the new number via SMS or call. Enter it to confirm ownership. At this point the account is migrated: the new number becomes the one associated with WhatsApp and keeps your data. From now on anyone looking for you has to use the new number.

What happens to chats, groups and contacts

The most frequent question is whether anything gets lost. The short answer is no, if you follow the official procedure. Here's the detail of what happens to each item after the change.

The most delicate point is groups and the contacts who don't update their address book. You stay in the groups, but anyone who doesn't save the new number might not recognize you right away. That's why notifying your contacts, even though optional, is useful: it shortens the period in which someone still writes to the old number that's now inactive.

Standard WhatsApp and WhatsApp Business: is there a difference

WhatsApp Business also has the "Change number" feature and the basic procedure is the same. The difference is in what's connected to the number when you work. A Business account carries the business profile (description, hours, address, website, catalog) and often automated messages, labels and any external integrations.

• On WhatsApp Business the number is tied to the business profile: after the change, verify that description, hours and links are still correct
• If you use greeting or away messages, double-check that they're active on the new number
• Labels and catalog stay in the app, but it's worth a round of checks
• If the number is connected to a platform or to Meta's official API, the connection has to be redone: the new number is effectively a different identity for external systems

In short: on the app side the data moves, but everything that lives outside WhatsApp (CRM, sending platforms, automations) knows nothing about the change until you tell it. This is the part businesses underestimate.

What to do on the business side when you change the marketing number

If the number you've changed is the one you use for support and campaigns, the real work begins after the procedure on the phone. A business number is published in dozens of places and every point not updated is a customer writing into the void.

• Update the number everywhere it's published: website, Google Business Profile, email signature, business cards, social media, printed materials
• Notify active customers with a clear message, for example: "We've changed our WhatsApp number. Save us as a new contact to keep writing to us"
• Reconnect the management platform: if you were using a multichannel system, the old number is no longer valid and must be replaced with the new one
• Check direct links like wa.me that contain the number: every "Message us on WhatsApp" button on the website needs updating
• Keep the old number active for a while, if possible, so you catch those who haven't updated yet

With a platform like SendApp this step is manageable in an orderly way: you reconnect the channel, choosing whether to use Meta's official API or the connection to your number via QR, and your contacts and historical conversations stay in your platform account. The integrated AI keeps answering and, where needed, translating messages, without having to rebuild anything from scratch. That way changing the number becomes a technical operation and not a gap in support.

Plan the change for a low-traffic moment, prepare the notice message in advance and make a list of the places where the number appears. Done with method, changing your WhatsApp number costs neither chats nor customers.