If you aren't able to send a message, here are a few solutions: WhatsApp connection problems are usually caused by your Wi-Fi or network data connection. I can't sign in to WhatsApp, WhatsApp not working, or WhatsApp is down It sounds obvious, but make sure you used the right number and international dialing code. Remember, you have to have a SIM card to register for WhatsApp. Also, you can only use one device per phone number. This way you will have the code read to you by a computer over the phone. If you still do not receive the code, try requesting a voice call. This is the country your phone number is from, not necessarily the country you reside in. Double-check that you chose the right country from the drop-down list. If the installation went smoothly, but the automatically generated message with your activation code never comes through, first ensure you entered your number correctly.

You can download WhatsApp for iOS from the Apple App Store. If you are an iPhone user, make sure it is running iOS 10 and above. If you are installing WhatsApp from a website, make sure the 'install unknown apps' option is enabled on your browser.

Scroll down, and look for Install unknown apps under Advanced.

Scroll down to Chrome (or the browser you are using to download WhatsApp).

Open Settings, scroll to Apps, and tap.

In case you use Chrome for Android, this is how you can enable it.

If you are trying to install the WhatsApp app from the WhatsApp website on your Android phone, you will need to make sure the Install unknown apps option is checked on the browser you are using. Note that WhatsApp does not officially work on tablets. WhatsApp also recommends having an unlimited data plan (or Wi-Fi). You can check your phone's current Android version in Settings > About Phone. In order to download the latest version of WhatsApp, you need to have a smartphone running Android version 4.1 or above.

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