Wired Headphones in Iphone 12

Hey there, Jennifool!

Thanks so much for using Apple Support Communities.

The type of headphones you can use with your iPhone 12 will include wireless as well as wired headphones that utilize a Lightning connector as opposed to the older 3.5mm format. You can learn more about this here: Use Apple headphones with your iPhone, iPad, and iPod

Hope this helps!

Clean the lightning connector of the headphones.

If you see an ‘Accessory may not be supported’ alert - Apple Support

Check the connections

Disconnect and reconnect the accessory to see if the alert goes away. If it continues to appear, check the connectors on the accessory and your device for damage or debris. If necessary, gently remove the debris and clean the connectors on your device.

Hey, Jennifool,

Did you get a chance to run through the steps in the article that Johnathan Burger shared?

If not, this is going to be the best place to start: If you see an ‘Accessory may not be supported’ alert

Good luck!