I was researching ways to boost cell signals when I found this. After reading many reviews I realized that the issue of weak cell signals can be fixed, easily and permanently, with a cell phone that can use WIFI to make receive calls text and data. A weak cell signal is a common problem with concrete and metal buildings shielding those signals out.  And many live in areas where cell signals are just weak.  But we always have access to WIFI at home or in the office. Republic Wireless solved this problem over two years ago. It uses VOIP calling backed up by both Sprint Cell and Verizon roaming. It also works world wide on WIFI for $5 a month. Service is unlimited and has no contract. An unlimited call and text plan is $10 a month, and unlimited cell, text and data is $25 a month. You do have to use their phone (Moto X $299 or Moto G $149) because they need Republic's proprietary software to work at these rates. I have been using them for over 18 months now and it has worked perfectly.