How do i turn off imessage online if i do not have my iphone with me?

Hello,

Deregister iMessage online

If you don't have access to your iPhone, you can deregister iMessage online. After you complete deregistration, your phone number is removed from iMessage services. You should be able to receive text messages right away but it might take a few hours for some Apple devices to recognize that you're not using iMessage when they send you a message.

If someone sends an iMessage to your Apple ID, you'll get it on your other Apple devices. If someone sends a text to your phone number, you'll get the message only on your phone.

From:

Deregister iMessage on your iPhone or online - Apple Support

If you changed away form an iPhone in 2015, you are no longer registered with iMessages. Even if you didn't manually deregister, your phone number would have been removed from the data base a long time ago.

Contact your carrier for help with your SMS problems.

Best of luck.

I am having a similar problem. I changed from iPhone around October 2015. My phone number is the same and I was able to get the code but when I entered it in I got this message: Your phone number is not registered with iMessage. I am not sure if that means my number is no longer registered or if it never was. If it never was I need help figuring out why I sometimes get delayed messages or do not even receive messages from iPhone users, such as my wife.