Facetime with 2 iPhone 4's using email.

Question

So with 4.1 released, can you make a facetime call using email with 2 iPhone 4's? Is it only for iPod touches?

Answer 1

Just to clarify things...
I was able to get a 15$/month voice-only prepaid plan that I added to my iPhone 4 (at least something good out of paying high price to buy the device already unlocked directly from Apple).
After inserting the MicroSIM in, nothing had changed. However, a couple mins later, the Facetime button suddently appeared in my contacts list. There's no registration or setting to play with at all.
Initiating the Facetime call won't send a voice call, nor does it send a SMS: my account on my provider's website still shows "0 mins, 0 secs, and 0 text messages" used, and I initiated/received a dozen Facetime calls so far. I know Facetime uses WiFi, but I was wondering if it would count as a quick voice call, SMS or something, to establish connection until it switches to WiFi. I confirm it doesn't.
However, people still do need to use my phone number to send me a Facetime call (it won't work if they try using my email). It's also my phone number that showed on their screen when I called them for the first time (they didn't have my number yet in their contacts list) so Facetime is really bound to your phone number on the iPhone, and there's nothing you can do about it
Also, if I remove the MicroSIM card, the Facetime icon disappear so don't count on borrowing a friend's MicroSIM for a sec, to activate Facetime on your device and then remove the card, hoping it will still work email-based. It won't.
It still suck that you are forced to pay a monthly fee only to have a phone number attached to the iPhone so you can use Facetime, while it works email-based on cheaper devices Apple should make that Facetime app (the one they use on iPod Touch 4G) appear if no carrier is detected so you still can use Facetime email-based.
Hope this helps.