Homemade Antenna Signal Pre Amp How Can I Get More Cell Phone Signal Inside My House?

How can i get more cell phone signal inside my house? - homemade antenna signal pre amp

Hello,
I now T-Mobile and I have a Motorola RAZR V3 and I have no signal in my house ... How can I get more signal in my house, in addition to the purchase of a label antenna cell phone or a complaint to the company? Is there some kind of home-made project that you can not improve the signal? ... as an antenna for your home? ... Ideas please?