Apple today released a new web tool for users to deregister their phone number from iMessage in the event They switched to a non-Apple device. To deregister a phone number from iMessage, users simply enter their Phone number in Apple’s web tool, receive a free text message containing a code, and submit the code to Complete the process. Users who still have their original iPhone can also transfer their SIM card back to the Device and go to Settings -> Messages to turn iMessage off.
Users switching from an iPhone to another device were often unable to receive SMS messages from another iPhone due to their phone number still being linked to iMessage. These specific errors with iMessage have been a well-known issue since 2011, which is when the messaging service debuted with iOS 5. They were also made even more apparent this past May, where a server glitch caused widespread message delivery problems. Apple was even sued over the matter in a California court, although the company claimed that it was aware of the issue and could not provide a fix.

Apple’s web tool for deregistering phone numbers from iMessage is Available Now.