In case you're switching from IOS device to Android or Windows Phone, Apple has implemented the de-registration feature for iMessage that allows you to de-register from that service as the de-registration feature had been plagued back then like there was no way you can de-register from there and that your messages were still left intact like the plagued trash Apple might or might not know.
But each device may have its own phone number so you will need to keep your personal profile and contact information updated on every services and devices you own.
