HOW TO SWITCH OFF APPLE IMESSAGE AND FACETIME
==> Transfer your SIM card to your iPhone.
==> Go to Settings.
==> Tap Messages.
==> Turn iMessage off.
==> Go back to Settings.
==> Locate and Tap FaceTime.
==> Turn FaceTime off.
==> Exit Settings.
If You No Longer Have Your iPhone
If you have given your iPhone away, or lost it, or someone has stolen your iPhone, you can turn off iMessage by visiting the Apple website.