How can i get 3g sevice in a 2g zone?

i live out in the country and would like to know what i could buy to get 3g service in my home where i have 2g service. i have been looking online and it gets confusing on what i need like between a repeater, amplifier, antenna booster. i know it can be done a coworker told me that his father in law did it with att but then again the guy is a communications engineer and i want to do it for tmobile their ain't many products for it