When someone searches for a service or clicks a bookmark they saved months ago, they might land on a page that no longer reflects what your site actually offers. This happens on any business or service website over time: a promotion ends, a service is discontinued, or a page gets reorganized. The problem becomes more noticeable on phones and tablets because a visitor who hits a dead end has fewer ways to explore your site quickly compared to someone on a desktop with more screen space and visible navigation.
One practical step is to set up redirects from old page addresses to the closest current page that still serves the same purpose. If no equivalent page exists, a short explanation with links to related sections works better than a generic error screen. The key is to check which old addresses still receive traffic, since not every outdated page needs the same treatment. Your hosting or analytics tools can usually show which pages still get visits, and that helps you prioritize which redirects to set up first.
When you restructure or move content, the layout changes can affect how pages appear on smaller screens in ways that are easy to miss. A page that looks fine on a wide monitor might have a broken layout, overlapping text, or a missing button on a phone. After any content move, it is worth opening the updated pages on at least one phone and one tablet to see whether navigation, images, and key information still load and display correctly. This does not require special testing tools, just the devices you or your colleagues already use.
Keeping a simple record of which pages you have moved or retired helps the next time you make changes. A short note with the old address, the new address, and the date of the change is enough. If you work with a developer or a hosting provider, you can bring that list and ask them to confirm that the redirects are in place and pointing to the right destinations. You do not need to do this all at once; handling the pages that still get visits first is a reasonable starting point.