Update to its 6 while traveling with Turkish sim

[mcskeeto]

Hi all. Would really appreciate your help on this. I am on vacation in Turkey currently and noticed that ios6 is available today. I have AT&T service back in the U.S. but unlocked my phone prior to traveling. I bought a Turkcell sim card upon arrival here. Does anyone know if there will be a problem upgrading to its 6 with a foreign sim card in my phone?

Thanks