Thanx Laurs, I will def do that on my next o/s trip. So ... any unlocked mobile phone will be ok?? And you can pretty much get a local sim card in most asian countries?? Sounds like a much cheaper and easier option ... thanx!
Just for anyone who is interested, a MBK floor guide ....
There are 8 floors and 4 zones on each floor. The zones are A B C and D, with A being near the skytrain end and E being near the Pathumwan Princess Hotel end.
Ground floor Apparel, fashion goods, leather, jewellery, silk, supermarket (we never found the supermarket!), DVD's and CD's in zone B
2nd floor Apparel, fashion goods, leather, gold and jewellery, and I think cosmetics on this floor too
3rd floor Same - apparel, fashion goods, leather, gold and jewellery, CD's, DVD's. Also on this floor (in ZoneD) is a really cheap area called "The Image" much like a market area. You'll know you are there cos there are these coloured circle things hanging from the roof. Unfortunately we didnt discover this area until 3rd day!
4th floor Mobile phones & asseccories, cameras, appliances, IT, banking and exchange in zone D
5th floor Furniture and home decorations, Fifth Avenue Food court in zone A (this place is gr8, very very cheap and quick and lots of variety!)
6th floor CD's and games, food centre, Thai handicraft products and cheap market clothes this is in zone D i think with some good bargains to be had in here.
7th floor Theatres, bowling alley, karaoke, games zone
8th floor Theatres, MBK's Offices
So ... hoping this is of some help to anyone going there soon. There are touch screen directories scattered everywhere, but I still found it hard to find what I wanted on them. There are food outlets on every floor, but the main ones seem to be on 5th 6th and 7th floor. Beauty/Massage places are on either 3rd or 5th floors. All money exchanges are on 4th floor zone D. Post Office is on 2nd floor zone B. Tokyu Dept Store is 4 floors in Zone A and worth a look at.

Kitty