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If I were you I'd use the money you are about to spend on various bits of kit to get yourself a decent connection of your own.
In my experience the bandwidth of the free wifi is not that great. Most of these services are designed to chuck you off the router after a certain amount of time.
It is also not that secure - in principle it is quite a bit easier for "any passing 13 year old" to hack your computer if you're connected to an open wireless connection.
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