As long as your phone is 3g and above, can be used.

You can check your phone capabilities at www.gsmarena.com.
As long as your phone, under the network 3g -> having 2100, you should be fine.
For your info:- Japan Coverage
As you can see, there's not GSM network but only 3g.

Airasia daily flight to Tokyo-Haneda will arrive at 11pm, I'm wondering how much is the MRT/taxi fare to city ?

walau.... it's crazy expensive... it is by coach or taxi or train ?

What time is the last train/bus schedule? BTW, I plan to travel with my spouse and a 2 year old child, is it ok to bring small kid to Japan ?

Actually the objective of this trip is to explore Tokyo - shopping, sightseeing, etc... for 7D5N.. the reason not to travel to Osaka/Kyoto is because I'll be bringing a kid there.... do u think it's wasteful not to explore to other cities instead of just Tokyo? Do you think 7 days in Tokyo alone will be too much ? Btw, which area of Tokyo has a good central location with nearby MRT with a decent price around RM300++ per night?

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Added on October 29, 2012, 5:10 pm

Is there any hassle taking the city train with all the luggages because my feeling is that the Tokyo's city train is hugely packed with peoples?

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Added on October 29, 2012, 5:13 pmIs Tokyo within the Fukuyama radiation zone? Is it safe to travel to Tokyo next year?

The are midnight limousine buses to Tokyo-lah.. check 1st page. price will be almost doubled the normal rate so a 900yen normal rate probably cost ~1600yen/pax by bus.

Otherwise, just sleep overnite in the airport. just on those chairs will do

By taxi, the rate will be fixed too.. can't be so high as RM500 as I can see brochure advertising fixed midnite taxi at ~6000yen (RM240)

In Japan, transportation cost is not cheap even using MRT.. imagine min rate per stn already ~160yen or RM6.50!