I have a Samsung Galaxy Tab 2 10.1 WiFi only when I want to surf the net on the move I WiFi teather it to my smart phone and access 3G that way. The smartphone acts as a WiFi hotspot (it is encrypted so no one else canaccess it)
If you already have a mobile phone plane with 3G access that allows teathering then this will be the cheapest option, the Tab will obviously pick up on WiFi at home and any hotspots like Costa Coffee etc
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