Which Japanese cell phones work in the US?

I'm going to Japan and I wanted to buy a Japanese cell phone. I was wondering if I will be able to use the cell phone in the US. I know that US companies will not be able to support all the Japanese cell phone features.

We are traveling from LA to Guatemala--we have regular US cell phones have an unlocked phone we purchased in Thailand--over there we just had cards inserted as we traveled. Just curious which works in central America!

A Cingular guy told me that I can purchase an unlocked GSM phone in asia and use it in the US with a US Cingular SIM card. Can anyone validate this? The US phone designs suck. They're just ugly. I probably won't use/need all of the capabilities of the...

I'm going to St. Thomas on vacation---will my cell phone work? If so, is it going to cost an arm and a leg to use it? What's the cheapest way to call the US from the USVI?

I am planning a trip to Bogotá, Colombia, and I am curious if my cell phone will work there. I am in the US and have Verizon Wireless, but I could change to another provider if necessary.

i'm going on a family road trip to Canada in about 2/3 weeks.. i was wondering, will my cell phone still work when i'm there? will i be charged for calling someone? how about texting? i have unlimited texting, will it charge me if i texted from canada...

Work wants to give me a mobile (cell) phone. How do I make this work most effectively without having to carry two phones everywhere I go? Work has finally organised a mobile phone for me. However, since I first asked, I've gotten myself an iPhone 4 ...

I'm looking for a cell phone with above average audio quality. I'm not looking for audiophile quality but something better than most phones have. The only phones I see that make an attempt at this is are these with HTC phones with "Beats Audio"...