hey.. i'm planning to go to USA or maybe UK for my further studies... so i was wondering that can i use my NOKIA 5800 XM there ? i bought my 5800 from india... so when i go abroad will i be able to use this phone or i can't use it abroad ? and also my network provider is AIRTEL so can i use my AIRTEL number abroad to make local as well as international calls to india ? and if i don't use my AIRTEL number and instead i use some local number abroad can i use that sim card with my nokia 5800 ? please answer this... i need to know !!! thnx in advance !!