You Don’t Store Your Old iPhones Properly
Another easy way to ruin your iPhone, even if it’s one you just keep as a spare, is to not store it properly.
Yes, there is a right way to store your old iPhones, especially if you want to use them in the future.
The first thing you need to do is to charge your iPhone to 50%. Apple recommends that keeping it like this will ensure your battery doesn’t get damaged over time.
Moreover, you should store your iPhone in a place that doesn’t get affected by the sun or high or low temperatures. You should also avoid dust and the possibility of water getting in your iPhone.