For some of us, the text size on smart phones is a little small. Fortunately, there are a couple of ways to increase the text size. By going to the Settings > Display & Brightness > Text size, you can adjust the text size as needed. However, not all applications are programmed to accept the adjustments.
The second way is using the Accessibility setting and turning on “Large Text”. See diagrams to the right. Apple’s IOS 9 will contain new optional type fonts intended to reduce the issue for most people.
The Android phones have a similar function as a part of the accessibility features. From the Setting Application >>Display >> Font size .. select one of four font size options.