Can I boost wifi signal to my cell phone?

[kopian]

The only way to do this is if you move your router to a more open location in the building, preferably closer to your handheld device.

Keep the router from being enclosed in well-insulated areas.

[Liatech]

I had a similar problem and before solved it I looked through a bunch of online stores. I stopped on this http://www.myamplifiers.com (thanks Digi!)) as only there I've just received answers to my questions. Prices are very pleasant. And now I'm happy owner of two boosters AT 600 and AT40003G. Everything works fine.
I think you also can find the "right" booster there))