Ad Hoc: Sharing a wifi connection in use?

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http://askubuntu.com – Say my laptop is connected to a WiFi hotspot. Is it possible to simultaneously create an ad-hoc network for that same laptop, so I can connect my phone to my laptop instead of directly to the WiFi hotspot? The wifi reciever in my laptop is much stronger than in my phone, that's why I'd like to see if this is possible. (HowTos)