Switching Celphone Networks

I'm not totally satisfied with my current cellphone provider because most of the time we don't have a good signal in my house and sometimes none at all. In fact, my husband is no longer using his cellphone because it doesn't have any signal at his work. It's as if we're just paying our cellphone bills for nothing. My husband is just using the cellphone that is provided by his employer. I was gonna have it discontinued but we're still under contract. But this coming March we'll be done with our contract then I'll switch network right away. I want to get htc desire hd as replacement for my old phone. It would be nice to upgrade to something nice and usable.