Apps Keep Crashing
A common problem with older iPhones is that they can’t run new apps as well as they used to.
As we mentioned before, most apps get updates that are more demanding because of all their new features. The result will be that your iPhone won’t be able to handle these apps, and they’ll crash randomly.
In the worst-case scenario, your old iPhone might not even be able to install these new apps, which would leave you with older, unsupported versions of the app or trying to find a good replacement.