By QuickMessage Team · Last updated November 3, 2026
Quick answer
The WhatsApp Business app works on your main phone plus up to 4 linked devices, such as WhatsApp Web, the desktop app or another phone. Linked devices are logged out if the main phone is not used for more than 14 days. If more than a few people need to reply from one number, use the WhatsApp Business API with a shared team inbox: every agent gets their own login, chats can be assigned, and there is no 4-device limit.
Many businesses start with one phone on the shop counter. As enquiries grow, the owner, sales staff and support team all need to reply from the same number. This guide explains your options and when each makes sense.
Option 1: Linked devices in the WhatsApp Business app
- On your main phone, open WhatsApp Business and go to Linked devices.
- Tap Link a device.
- Scan the QR code shown on WhatsApp Web, the desktop app or the other phone.
Limits to know:
- Up to 4 linked devices at a time, plus the main phone.
- Use the main phone at least once every 14 days, or linked devices are logged out.
- Everyone uses the same account, so you cannot see who replied, assign chats or limit access.
For step-by-step help with the web version, see our WhatsApp Business Web login guide.
Option 2: WhatsApp Business API with a shared team inbox
On the API, your number is connected to a platform instead of a phone. Your team works from a shared team inbox in the browser or a mobile app:
- Each agent has their own login.
- Chats can be assigned to the right person, with internal notes.
- Chatbot flows can answer common questions before an agent joins.
- You can send approved template messages to opted-in customers at scale.
Option 3: Keep the app and add the API (coexistence)
With coexistence, you can keep using the WhatsApp Business app on your phone and connect the same number to the API. Your contacts and recent chat history are synced, but the number's API throughput is fixed at 20 messages per second. Read can I use my existing number for the WhatsApp Business API for the details and the other options.
Which option should you choose?
| Your situation | Best fit |
|---|---|
| 1 to 3 people reply, a few dozen chats a day | Linked devices in the app |
| You want to keep using the app on your phone but also need automation | Coexistence |
| A team replies, you need chat assignment, reports or broadcasts to many customers | WhatsApp Business API with a shared inbox |
Frequently asked questions
How many devices can use one WhatsApp Business account?
The WhatsApp Business app works on the main phone plus up to 4 linked devices. On the WhatsApp Business API, agents use a shared inbox platform instead, so this device limit does not apply.
Can two phones use the same WhatsApp Business number?
Yes. A second phone can be added as a linked device to the main phone's account. The main phone must be used at least once every 14 days to keep linked devices logged in.
Can I see which team member replied to a customer?
Not in the WhatsApp Business app, because everyone uses the same account. In a shared team inbox on the API, each agent has their own login and chats can be assigned.
Let your whole team reply from one number
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