Normally, this problem can be caused by network problems on Android or iOS phones. Knowing causes is good for us to deal with unexpected problems. Let’s go straight away to some of the reasons.
Reasons: Main Causes of Failing to Send & Receive Messages on WhatsApp
There are three major causes that might lead to the malfunction of WhatsApp or WhatsApp Business. You can check out those below and see which one might possibly be the one responsible for your problem.
1. Bad network connection. If you’re connected to a Wi-Fi network, you should ensure that it’s working well. Or, if you’re using mobile internet, make sure that you stay somewhere that has a good signal.
2. Verification has not been completed. Make sure that you’ve completely finished verifying your phone number so as to associate your contact with the account.
3. Being blocked by a certain contact. It’s sad that it’s of possibility that you are blocked by the one you’re trying to text. You can tell whether you’re being blocked by a person from these facts:
Fail to make any calls to a contact.
Cannot see updates to a contact’s profile photo.
Cannot see a contact’s status like “last seen” or “online” in the chat window.
Note that any messages sent to a contact who has blocked you will always show one check mark (message sent), and never show a second check mark (the blue ticks).
Method 1: Things to Try if there is a Network Problem
The most common reason why you cannot send or receive WhatsApp messages is a bad Internet connection. Luckily, there are ways to fix your network problem on your iPhone. Please take a look.
Check whether the router is working or change to another Wi-Fi network.
Turn on & off “Airplane Mode” on iPhone/iPad through “Settings” or “Control Center”.
Use mobile data rather than connect to a Wi-Fi network.
Reset network settings on iOS via “Settings” > “General” > “Reset” > “Reset Network Settings”.
Method 2: Restart Your iPhone or Android
Perhaps it’s just a device glitch. Please know that restarting the device is always helpful to get rid of snags like this. Therefore, please try to reboot your iPhone or Android and see whether the problem is solved. Press and hold down the “Home” and “Power” buttons until it’s off, then, reboot the device with the “Power” button for iPhone and long-press the power button and select ‘restart’ for android users.
Method 3: Re-install WhatsApp
If the issue persists, perhaps it’s a bug on WhatsApp, or WhatsApp is not properly installed. Therefore, you might need to check for an update or re-install the app on App Store for iOS and Playstore for android.
Method 4: Reset iOS Device to Factory Settings
If the methods above don’t come to help you out, I’m afraid there is a final resort to which you might give consideration; that is to say, restore your smartphone to factory settings. Since resetting is able to wipe out all settings, it’s possible that the malware which making this headache would be eliminated. Please make a backup of your iOS and follow the steps below.
Step 1. Open “Settings” app on iPhone/iPad.
Step 2. Tap “General” and down to the “Reset” option.
Step 3. Select “Erase All Content and Settings”.
Note that you can also do it on iTunes via the “Restore iPhone” button on the Summary page.
Hope this helps and for more related content check here.