It’s a wonder how many different tools your iPhone can tun into, including even a magnifying glass. It can be quite a useful feature for long-sighted people who find it difficult to read a fine text (or during a treasure hunt to find the hidden clues).
To tun your iPhone into a magnifying glass:
- Go to Settings > Accessibility > Magnifier
- Toggle on the Magnifier

From now on, whenever you’ll triple-click the home button, your iPhone’s camera will turn into a magnifying glass, and your screen into a viewfinder.