Originally Posted by
KingBuick How would I do that? I only see in the message send and receive list settings the option to add an email address. If this works, does this mean that I won't have to go around telling all my contacts that my number has changed?
Toggle iMessage on and off and wait until "Waiting For Activation" is gone from under that toggle. You'll see that it will now show your new phone number and your old number as an option.
Note: When you toggle iMessage on and off, let it activate over cellular and not Wifi. For some reason it seems to activate faster.
Also, if you want your contacts to just continue to message you to your old number then just simply keep it check marked under "Send & Receive" and you won't have to mention anything to them.