How to fix your WhatsApp if it don't supports you again
How to software update your iPhone 10.3.3 to make it downloads app
iPhone 5c, iOS 10
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There is no fix for an outdated iPhone.
(sorry) You have an outdated iPhone, it can’t be update to a higher iOS (12 and later).
Your iPhone is no longer meets the requirements for many apps.
WhatsApp requires iOS 12.0 or later.
Yes, most apps require iOS 12 or later.
Considering a newer type of iPhone?
Read this before you buy a newer iPhone.
Apple Store -> iPhone - Buying iPhone - Apple
Apple Certified Refurbished -> Refurbished iPhone Deals - Apple