zBoost YX510PCS Dual-Band Cell Phone Signal Booster for $269.99 shipped. Here is a screenshot for your reference. This is meant to increase cell phone signal strengthe in an area where dropped calls occur frequently. It works with 1900MHz and 800MHz, which include AT&T, Verizon, Alltel, T-Mobile, Metro PCS, Cricket, Suncom, Sprint but not Nextel. Most places have this device for $299 or much more.