Niall Horan recalls during the song how after chatting to the girl for a while, she gave him her phone number.I want your number tattooed on my arm in ink, I swear
The girl actually wrote her number down on a piece of paper," he explained in a Genius attribution
. "In a world where we're like looking at your phone, everyone showing numbers, swapping contacts, all this, and I like the idea of the actual physical piece of paper with a number on it."
Payne added that when he's writing songs based on a true story he likes to elaborate on what actually happened to make it more interesting. In this instance he latched onto the visual of the girl writing the number down; Payne switched it up to be like a music video where someone is looking over the arm and it's got like a phone number on it. "I just thought it was a quite colorful lyric," he said.