Hi Jim
I have been using a Wilson 4g booster for 3 years and it definitely helps bring in the signals in weak areas.
It is not super powerful but you can expect to improve 1 to 2 bars on 4g and get 1 bar 4g from 3g.
I have a verizon account and use PDANET app on my Android phone which creates a WIFI hot spot for up to 5 devices.