Hi all!
I've finally done it with my ported number! First I have to restore my phone, which actually resets and then restores from a back-up. My steps:
Sync your phone to your computer (I don't use iCloud Syncing, but that my work too). This makes a backup.
Then Restore your phone from iTunes. Upon completion of the resetting part, don't yet restore from your back-up. Use your phone and go through the whole process of setting it up on the handset it's self so that you can access the iMessage setup area. Then follow the setup procedure found on: http://www.theonlinemac.com/wind from our wonderful smcclay. I think I then turned off my phone and turned it on again to confirm it still worked, and yes it did.
Then, do a restore from a back-up from iTunes. I think after I did that, I think I had to do the steps again from: http://www.theonlinemac.com/wind.
My reasoning, if you can call it that, is that the phone gets stuck with the old info from the old SIM. Resetting and then trying theonlinemac procedure before a restore from back-up makes sure there is nothing left of your old info. Then the restore part can use the new info but give you all your needed old stuff.
Totally a hassle, but still worth it and it would be totally worse if we didn't have smcclay's website.
I donated, and everyone else that uses it should too. We need to keep it going until Wind gets their act together.