Most, if not all modern laptops have a wireless card built in, in order to connect to a wifi network. A mobile, or data card, that uses a cellular connection is often built into a netbook, however it will have software for the appropriate carrier built in, such as ATT Verizon, etc...
You disconnect and reconnect just like you will with a data card, the only difference is the data card is built in.
However, if yours does not have that, then it's just a small laptop.
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