Buying an iPhone 5s Indonesia?

I live in Indonesia. I want to buy an iphone 5s but my local carrier provider haven't provide it yet. I know that i can buy unlocked model from apple store, but that means i buy the us model right? My local provider said that they still testing the iphone 5s with indonesian network. Several of my friends have already bought it outside the indonesia, and used it in indonesia, and haven't encountered any problem with the network. My local provider already confirmed that iphone 5s will be available in indonesia but it could be 2-4 months until its available. My question now:

if i bought the iphone 5s unlocked from the apple store, will it work smoothly on indonesian network?
i know that there are several iphone 5s model number to identify its country, are there any differences between them?
if the difference will influence the phone, is it worth it to wait for 2-4 months?

Hi, I'm currently selling iPhone 5s unlocked and my company can ship worldwide. Feel free to email us at nationofapple@gmail.com and I can give you the best price possible. Are you interested in 16GB or a larger storage? I can probably offer you a better price than the Apple store after all the taxes…