For those obsessed (like me) with finding 4G signals and you have an Android device, this app LTE Discovery has helped me: https://play.google.com/store/apps/details?id=net.simplyadvanced.ltediscovery
If you buy the pay version for a few dollars, it will keep cycling the radio every 30 seconds until it gets a LTE signal, and you can even setup audio alerts. It has screens that tell you which tower you are supposedly connected to, although I haven't had much success pinpointing which tower I'm on. It says Sprint towers give out more information than other carriers, but I have driven to the GPS coordinates where it reports the tower it was connected to and have not been able to locate the tower or home in on a stronger signal.
I've been mapping signals in the Newport, Covington, and downtown Cincy area with Sensorly, although many times the LTE signal near the river isn't strong enough to hold for very long.
http://www.sensorly.com/map/4G/US/USA/Sprint/lte_310sprint#q=Newport%2C+KY%2C+USA|coverage
I would love to hear when and who got the mystery strong signals near the south end of the Bailey Bridge. I have not been able to replicate anything like that. I marked up a Sensorly snapshot below with green circles of my contributions that weren't on the map before and circled the mystery Bailey Bridge LTE in yellow.
Why is it taking so long for them to roll out strong LTE in the downtown area is really frustrating to say the least. One would figure that you would want to hit that area first then spread outward. If anyone can shed some light on why it's being rolled out there last, I would love the enlightenment.