It's easy to change your display name when you're calling someone - and it can be useful to do so, especially if you have a long or difficult-to-pronounce name. Here's how:
1. Open the Phone app on your iPhone.
2. Tap the Contacts tab at the bottom of the screen, then tap on the contact whose name you want to change.
3. Tap Edit in the top right corner of the screen.
4. Scroll down and tap on Add Field, then select Nickname from the list of options.
5. Type in the nickname you want to use for this contact, then tap Done in the top right corner of the screen.
6. Tap Done again in the top right corner to save your changes and exit editing mode.
Now, when you call this person their new nickname will appear as their caller ID instead of their full name - making it easier for you (and them) to know who's calling without having to look at your phone every time!