This is quick and easy, head over to https://selfsolve.apple.com/deregister-imessage/ and fill in your mobile number. It’ll then SMS a code which you need to input into the site and then it’ll deactivate iMessage for that number.
I’ll be clearing out some Apple hardware shortly and other bits and bobs. Email sensible offers to email@example.com. Anything not sold over this weekend will head to eBay with a higher markup. Apple Mac Mini, Late 2012 (boxed): Synology DSM DS713+ (with 2x 3TB WD Red Drives, boxed): Samsung SyncMaster T23B551 24″ HDTV Smart TV/LCD Monitor Samsung SyncMaster S24B350…
You can get quick information about any of your Apple devices by using their self service warranty information page, located here. For serial numbers from iPhones and iPads it’ll show supported networks, current warranty status and a little more. Its also useful for checking legitimacy of serial numbers.