I have an iphone that is hacked for myself to use in Canada that came with 1.0.2 and I have since updated to 1.1.1 and running anySim. All is good there and I don't want to touch it.

I have another iPhone that is with AT&T not unjailed or hacked that came with 1.0.2.
and I have since updated it to 1.1.1 and then 1.1.2. I use this phone when I am down in the US not to incur roaming charges. Since I am down there a lot it is cheaper for me this way.

I have a new iPhone that came with 1.1.2 and the new bootloader. I have downgraded it to 1.1.1 but of course can't get anySim to work on it.
I want to give my GF an iPhone to use in Canada and bought it for that reason.

I am wondering if I can simply recover my newest phone and use the AT&T Sim in there.

And then jailbreak the older phone and install anySim in it.

The second part I know I can do... But can I simply reactivate the new phone through iTunes with the old AT&T Sim?