My WhatsApp stopped working

OK if you really want to update this phone you will need practical help

If using wi-fi then check all of these carefully:-

·       you are on a good Wi-Fi, (from 15.4 iPhone 7 up, you may be offered cellular update)  and  that the router is connected to the internet.

·       Plenty of spare storage – 6GB at least.

·       on charge with more than 20%, OR 

·       off charge with more than 50%

·       low power mode turned off. 

·       Check you have no Beta profile installed. (Check Settings, General, VPN & Device Management)

·       no VPN installed (Check Settings, General, VPN & Device Management)

Resources:-

Update iphone

Update your iPhone or iPad - Apple Support

However I strongly recommend you learn how to update your iPhone via recent Macs here:-->

Update your iPhone, iPad or iPod touch with the Finder – Apple Support (UK)

or older Macs and PC here:-->

Update your iPhone, iPad or iPod touch with iTunes – Apple Support (UK)

KB Article - Iphone will not update

If your iPhone or iPad won't update - Apple Support

I agree, not arguing, i just think

1. it will not be long before 12 is no longer supported by WhatsApp
2. Most other apps are not supported on 12 akready
3. iphone 6 is therefore "obsolete" to all intents and purposes

So I still recommend a newer phone

You will not get WhatsApp to work on an iPhone 6. You need 6S or newer.

As far as I know Whatsapp like most other major apps require iOS13 or later and your phone will only go to iOS12

According to WhatsApp, it will run on iOS 12. What problems are you having with it?

https://faq.whatsapp.com/447316522857192/?cms_platform=iphone&helpref=faq_content

they are on ios11

Yes but a 6 can be updated to iOS 12.5.6.