How I updated whatsapp..?
How can I update software
iPhone 6s, iOS 10
Question marked as
Top-ranking reply
You need to update to the latest iOS for your 6S to use WhatsApp which is iOS 12.5.6.
Go to Settings > General > Software Update.
Update your iPhone, iPad, or iPod touch using WiFi -
Update your iPhone or iPad - Apple Support
Update using your computer -
Update iOS on iPhone - Apple Support