Is your iPhone 8 restarting unexpectedly, freezing, or not turning on? You might have a faulty logic board, and if so Apple will replace it for free.

“A very small percentage of iPhone 8 devices contain logic boards with a manufacturing defect,” according to Apple. “Affected units were sold between September 2017 and March 2018 in Australia, China, Hong Kong, India, Japan, Macau, New Zealand, and the U.S.”

Think that might be your phone? You can enter your serial number here to find out. If eligible, your phone can be fixed free of charge at an Apple Store or an Apple Authorized Service provider. There’s also a mail-in option.

This only applies to the iPhone 8, which came out late last year. The larger iPhone 8 Plus is not affected, and neither is the iPhone X or any earlier iPhone releases.