4 Ways to Fix Unable to Use WhatsApp on Two Devices on iPhone and Android

Before you begin, ensure there are no problems with the network connectivity on your device, and install the latest version of WhatsApp from the Play Store or App Store.

Fix 1: Change Minimum DPI Using Developer Options (Android)

The linked devices feature was initially meant for WhatsApp web and desktop apps – meaning this feature was meant to be used on larger screens.

If you’re trying to add your WhatsApp account on a second phone and not finding the option to link devices, you can manipulate your phone to act as a larger device by changing the DPI – Dots Per Inch.

Note: You must change the DPI only on the second phone on which you want to use WhatsApp, and unfortunately, it is not applicable on an iOS device.

Open Settings > About Device > Version. Tap several times on the Build number until you get a message saying, “You are now a developer”.

Step 1: Now, open developer options. Open the Additional Settings menu in the settings app or search for Developer Options in the Settings app search bar.

Step 2: Tap on Developer options. Scroll down to find and tap Smallest Width. Change the value to 600 and confirm your change.

Fix 2: Check the Number of Linked Devices

WhatsApp has a limit on the number of devices that you can use the same WhatsApp account on. You can link a maximum of four devices, so ensure that you can still link a new device.

Step 1: Open WhatsApp on your primary device and open WhatsApp settings.

Step 2: Tap on Linked Devices and check the number of devices. If it is less than five devices, you can add more devices.

Also Read: How to log out linked devices from WhatsApp account

Fix 3: Clear WhatsApp Cache

Clearing the cache for an app on your Android device erases all the accumulated junk files responsible for executing bugs.

On Android

Step 1: Long-tap on the WhatsApp icon > tap on App Info.

Step 2: Tap on Storage usage > Clear cache.

On iPhone

Offloading an app clears all cache and junk files. This can remove any bugs from the app.

Go to Settings > General > iPhone Storage > select WhatsApp > tap on Offload > Reinstall the app. Don’t worry; this will not delete the chats or media files.

Fix 4: Reinstall WhatsApp on Secondary Device

Lastly, if none of these methods work, try reinstalling WhatsApp on your secondary phone. A freshly installed app may erase all the bugs from the previous version.

Note: Do not uninstall WhatsApp on the primary device. You will lose all your chats.