Stupid airport extreme question

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If she has cable + internet, it may be possible (as Newt mention) that the internet modem was never activated (although the tech should have activated it during the install). If she has cable + internet +phone (VOIP), then most likely the internet modem is activated and ready to do. Whether it has WiFi or not it depends on the model. But you should take your own router (Airport extreme) and don't forget the CAT5 cable.