hi... i really hope someone out there can help me. i'm so confused!!!

my son is going to japan from the uk and needs a new phone before he goes. so...... i want to buy him a phone that will be good here in the uk but that will also work in japan.

i've heard that phones only work in japan if they are 3g. no problem the phone i'm thinking of buying is 3g.

but i've also heard that 4 quads don't work in japan.

i can only find a phone that is a suitable price that is 3g and 4quad.

will this phone work?

it's a sony ericsson elm.

here's all the spec.

http://www.gsmarena.com/sony_ericsson_elm-3057.php

my plan was to buy the phone here in the uk. buy a uk sim for him to use here and when he first arrives in japan. get the phone unlocked before he goes. let him buy a japanese sim when he gets there but he can use his uk sim in japan until then.

will my plan work with this phone?

many thanks from a very frustrated mother!!!!!!!!!!!!!