Authenticating on two different "official" iPhone networks

hi
i dont own an iPhone (yet).
question is this: if you have an iPhone account on two networks, such as AT&T and a network in Hong Kong, can you simply just insert the other network's SIM and it works? or do you need to keep on using iTunes to authenticate a network switch?
i would like to buy the non-locked iPhone on sale in HK, and use the same device when I travel to either place, using the local official SIM card.
how can this be done?
thanks

After making a change to another provider's SIM card, I believe you need to connect the iPhone to iTunes to authenticate the network switch.

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