iMessage and FaceTime stopped working...

Hi, everyone, this is my first post.

I used to regard myself as a poweruser but guess what, since yesterday I have spent almost 20 hours trying to solve this seems trivial problem.

and I gave up, I will not put IT on my CV again.

It all starts from iOS 5, I've forgotten since when my beloved iPhone no longer have the long battery life it used to have.

I decided yesterday to try a simple reset (without deleting data) on my iPhone to see if it would restore the battery life.

After that, I don't even have time to test the battery, I found my imessage and facetime no longer work.

It shows waiting for activation and not letting me to sign in with my apple id ("cannot connect to server due to error, try again" message)

So not even I can't receive imessage on my phone number, I can't receive by email too. Does anyone got any idea about this?

Please don't tell me to reset or something like that, I've tried all kinds of reset, they simply won't work on this phone.

Here's what I've tried:

1. reset network

2. reset all settings

3. restore to a previous backup

4. restore as a new device

5. DFU restore

6. take out sim card and put it back.

7. turn off wifi or 3g

8. remove imessage beta from my computer

.......

.......

I'm in New Zealand by the way. But I'm pretty sure the server's good as my iPad can still use these functions.