QUOTE(genki @ Apr 6 2006, 04:12 PM)

I want to buy a cellphone and there are two versions of the same phone I want- one from hong kong (factory unlocked), and one from Japan (which is unlocked by crackers to be used outside of Japan). Will there be a big difference between the two? I heard that sometimes phones unlocked by crackers will have some functions that you can't use, or there'll be issues with the system shutting down/rebooting often.. is this true? Is it just a minor problem? Usually, which functions will be disabled if it's unlocked by crackers?
Anyone know, or have experience with any of this?
Thanks in advance!

It depends on the phone and what the unlockers did to the phone. If all they did was unlock it then it's no different than if the phone company unlocked it. The difference in FUNCTIONS has to do with the software that's loaded and that varies between the different phone providers that the phone was originally intended for.
Assuming all the unlockers did was unlock the phone, then one of the differences you can expect would be the different default language installed (chinese for HK and japanese for japan or they could of changed everything into english). The default games, ringtones and wallpapers will also be different as well as any company logos that show up everytime you turn the phone on... etc...
What I would do is buy whichever is the cheaper one for you. Afterwards if you want to customise your phone I'd do research on your phone, get ahold of whatever programs are needed for your particular model, and buy a data cable (unless it already comes with one) for that model phone so you can connect the phone to your computer. By doing all that, you can customise your phone the way you want it. Examples are replacing the language installed into your native language (assuming a language pack is available in your language), loading ringtones, games and applications, getting rid of the stupid company logos, and unlocking any hidden functions. You can also update the firmware for the phone in order to fix any bugs in the phone, improved reception, faster menus, fixing any reboot/startup problems... etc... depending on the phone model.
I use a Motorola V505 myself, and it's fully customised into what I call the "S.E.S" phone. All SES custom mp3 ringtones so it plays different SES song for each and every person in my phonebook (fortunately SES has alot of great songs

), wallpaper, screensavers and video clips are SES. The small LCD on the outside of the phone lights up with "Sea.Eugene.Shoo" when I flip the phone open. Hell, I even modded the phone so I can activate the camera and take stealth pictures if I wanted to WITHOUT having to open the phone. All menus can be accessed on the small outer 1 line LCD.
And all this is on an "old" phone. The newer phones available now can do some pretty crazy things too. Most phones can be modded, you just need to research it.