It depends - on whether you plan to take your phone from the UK to Another Country (on holiday for example.) Phones sold in the UK are designed for the UK mobile networks - however - most of the phones manufactured in the last five years will be tri-band anyway.
Some triband.
There are many excellent triband cell phones. However, depending on your service carrier, a triban phone will not work in all places. Most Triband phones do not have the 850 MHZ frequency, which AT&T uses in many areas in the USA.Therefore, a quadband phone would be a better choice if you want to make sure your phone will work everywhere in the world.
Yes, triband phones do work in Australia.
what is the question
no
Yes, it works. I have one W350i too, and have tried it in US, is works pretty well!
iesse
yes they do
The Galaxy S3 is considered a Tri-band phone running on a 1.4 GHz Quad-core processor. It also supports HSDPA and 4G as well.
A sim card can be used in any unlocked GSM phone providing that the sim card isn't locked (which is rare) and as long as the band is right. (the razr is triband)
In the UK you need to dial 123 or 00 44 797 3100123
It depends you guys is there a GCP in your state.