How to see who you've called recently on your iPhone?

There's this friend I want to text but i don't know what her number is. I called her like a month ago or something so if I can see the numbers I called recently it should be there. I don't call people often so I think it should be there still. But how do you do that? I'm on an iPhone btw.

Tap Recents and choose a person or number. Calls you've missed are shown in red. Tap Missed to see only missed calls.

You can also tap Keypad and then tap Call, to bring up the number of the last person you called.