Hi Very newbee here need expert advice., Have new laptop (gateway) vista 4gb am tethering with unlimited media net. I ASSUME i can swap sim cards to an aircard and use my data plan(20.00 a mo.) to run the air card thru wap.cingular like I do tethering both my home pc and my laptop. will it be faster than the 115kpbs i get now ( i hope)? which card should i get does it even matter as long as it is 3g hsdpa gprs ect?