Cell Phone Signal Extender What Is A Good Wireless Cell Phone Signal Booster For A 1 Bedroom Apt & 2 New Cell Phones On Sprint Under $150?

What is a good wireless cell phone signal booster for a 1 bedroom apt & 2 new cell phones on Sprint under $150? - cell phone signal extender

I have 2 new phones from Sprint. The coverage is crap in my room 1 / 1 bath. At the door, okay. I do not know why, but it seems that most mobile companies do not work. I was wondering if anyone knew a good signal-amplifier or dilution works well under $ 150 for 2 phones? Thank you.