A friend has a caravan in the sticks. Looking at Orange and Virgin, they say only 2G available, not 3G. Could she use 2G to connect to the internet for browsing and emails? Would she need a dial-up dongle?
Has your friend looked at the coverage for other mobile broadband providers. I use "Three" in north Northumberland and it uses 3G. What about T-mobile wonder what their coverage is like. Best advice is to look at all the mobile providers and check their coverage.