This article explains how to pair a Bluetooth headset with an iPhone running iOS 7 or later.
How to Connect Wireless Headphones to iPhone (2024)
Before you start, check that both your smartphone and your Bluetooth headset have sufficient battery charge.
Open Settings on your iPhone, tap Bluetooth, and turn on the Bluetooth switch.
You can also turn on Bluetooth from the Control Center. Swipe up from the bottom of the screen, then tap the Bluetooth icon. The button will turn blue when the feature is active.