My air tag is not pairing with my I phone

What is happening when you try to pair the AirTag? You might want to reset the AirTag to see if it will pair after that

Here's how to reset your AirTag:

1. Press down on the polished stainless steel battery cover of your AirTag and rotate anticlockwise until the cover stops rotating.
2. Remove the cover and the battery.*
3. Replace the battery.
4. Press down on the battery until you hear a sound. This sound means that the battery is connected. 
5. When the sound finishes, repeat the process four more times, removing and replacing the battery, then pressing down on the battery until you hear a sound. You should hear a sound each time you press on the battery, for a total of five sounds. The fifth sound is different from the previous four. This indicates that the AirTag is now ready to pair.
6. Replace the cover by aligning the three tabs on the cover with the three slots on your AirTag.
7. Press down on the cover.
8. Rotate the cover clockwise until it stops rotating.