Hey sethowens9698 and thanks for coming to our site.
I wish I could say we'll be rolling out a compatible device that'll have this frequency, but we don't have any word on this. If you need more "coverage love" you'll want to Contact Us and have an account specialist file a Service Complaint for your area. That'll have our field techs look into this further for you.
While this thread is getting old, it speaks to the issue I just faced in the past few days. So thought I share this in case it helps others going down this 'rat hole'.
Have a new T-mobile LG K20 Plus (been a t-mobile customer for all of 1 week) and phone gets 3-4 bars (-109 dBm) LTE 4G Band 12 service in 1 window of the house. I'm planning to disconnecting my very slow DSL Verizon internet as soon as I work through this reception issue. With phone in the window and setup as a hotspot, I'm getting decent download speeds of up to 14.11 Mbps - upload speed and rather poor at 1.7Mbps. But I can't keep the phone in the window the res of my life.
So order the Signal booster ( one w/o the internet) and after t-mobile ordered the wrong one, I received the correct unit yesterday (Appreciate that T-mobile waived the $25 security deposit and shipping costs). Was all excited - plugged in the window unit, self-test seemed to pass, then green power light just sat there blinking green over an over for hours. Never picked up a signal.
After looking at this forum, it turns out that these 'free' boosters do NOT support T-mobile band 12, and that is the only t-mobile service I can pick up at my home. I called technical support this morning and the tech verified that they only support bands 2 & 4 and he did not know of any plans to update their units with a Nextivity model that supports band 12. So although T-mobile was will to send me another Signal Booster Unit thinking that perhaps the last one was defective, I canceled that order since it appears this unit will not work with the current T-mobile coverage at my house.
I suggest T-mobile ask their customers to determine what 4G LTE service they are receiving before wasting time and money (mine and theirs) sending out these units to people like me who only have band 12 available in their area. T-mobile is launching band 71 and also has band 66, so why aren't their boosters keeping up with their network technology? UNthinkable John Legere (CEO of T-Mobile).
Band 12 booster is now available. One caveat is that I have not been able to get the band 12 booster that they sent me to work with my Samsung J7 phone.