How to turn off iMessage without iOS device

A few things changed with ios 6 since original post. All you need to do now if you are in the same boat as OP is -change your imessage password.

The first solution provided by wjosten worked for me.

"1. Put your sim card(which I know you don't have) into another iPhone & turn iMessage off"

--> I used the new sim card that my telecom provider sent me (i kept the same phone number), I inserted it in another iPhone and turned iMessage off. Now I receive all messages sent from my contacts again.

Many thanks!

this did not help me

Once again, change imessage password- that is all.

Because I am neither an accomplished IT professional nor highly skilled in this area, I am passionate about getting the correct answer for my IT problems. This response reminds me of those I most often receive from the most accomplished of IT professionals. The correct course of action in this precise situation is for the user to unregister the device. At the time of the request, the user did not have an iOS device and exhibited no concern that messages were being sent to a stolen phone. The problem was that Apple's database still associated that contact information with an iOS device. If this user was finally able to replace the stolen iPhone, registering a new iOS device with Apple seamlessly restored iMessaging to the new device, and the user's expressed preference for Apple products indicates that other devices may have shared the associated Apple ID. There was really no need to inconvenience this user any more by changing the password. Either way, helping Apple keep the database free from incorrect information by unregistering the device was good for Apple, good for Apple Users, good for America. The best possible solution was provided by randers4 who exhibited a rare skill, paying careful attention to the user's concerns and offering the simplest and most complete resolution for the problem. Context is critical for understanding the correct solution to common technical issues.

Lmao

fromsouth: Tried this and it did not work. not sure why it works for some and not others. doesn't make sense.

what if i had previously unregistered my iphone, and it doesnt show up on i cloud?

The simples answer is just to call applecare and ask about have it deactivated

Unfortunately this is a huge issue. I went from a 5s to an android device and of course had the same problem. I went through all the steps of wiping my phone, deregistering it from my account as well as turning iMessage off on all my other devices. The only thing that worked was turning my 5s back on and turning iMessage off. I know this doesn't help if your phone is no longer available but hopefully someone at Apple will realize this is a problem.

Apple has, u just need to call AppleCare if they know what they r doing they can help

i dont see it!

How can you change your iMessage password if you don't have access to the device? I've looked everywhere and can't find anything.

Your iMessage password = your Apple ID password. So change your Apple ID password.