WhatsApp messages and call incoming not working when Iphone is Locked?

Did you also force restart the iPhone?

Force restart iPhone - Apple Support

I have no issues receiving WhatsApp messages and notifications after the latest iOS update.

Did you update via Wi-Fi?

If yes, try again, this time using your computer:

Restore your iPhone, iPad or iPod touch to factory settings

@milind34

If you update iOS using Wi-Fi, one the new parts of the software will be replaced, unchanged parts of iOS will stay on the device.

In some cases this might cause software issues.

An update via your computer will download a complete software package and install it onto your device.

No, updating the iPhone on your computer will create a backup, download the new iOS firmware file, erase the iPhone, install iOS and, as a last step, restore your data from the backup created before the update.

That's also a reason, why the size of the firmware is around 6GB, compared to the smaller size of the file, downloaded via Wi-Fi.

This is the only way to rule out an iOS software issue. If any apps do not work as expected after that, it is most likely the app, that is causing the issue.

I have no problems using WhatsApp after the latest iOS update.

Dear Ingo 2711,

1. Unchanged part of the software is supposed to stay on device! in fact the when a new change comes in it is built “with“ or “on” the rest of code so it shouldn’t affect anything
2. If it does Apple is trash!!!
3. I freakin’ reset the phone erased all data and setup it as a new phone and the problem still remains

This makes no sense! What do you mean by update via computer?