1. Three finger zoom
First up on our list of iPhone tips and tricks will definitely come in handy. Buried deep within your iPhone's Settings is a nifty little feature to help you zoom in on your screen.
This is usually disabled by default and we doubt you've been told about it. Once activated you can double tap the screen with three fingers to zoom in.
If you also activate the Zoom and Show Controller option you'll get a handy little pan tool to help navigate around your zoomed in screen.
To activate these features go to Settings > General > Accessibility > Zoom.