As others have said, rootmetrics still hasn't updated their app to support sprint triband devices, and it's been over a year. They don't seem interested in supporting their app.
Sensorly seems to be the best, although they do have a few problems with their mapping. I.e. Sprint LTE mapped in Oklahoma where there is none.
This is a galaxy Note 4. The reason it's picking up LTE so fast, is because that B26 LTE is the only good Sprint signal it's seeing. When its roaming, it's desperate to find any Sprint service. In an area that has a weaker B26 or stronger 1x/EVDO, it will take the normal ~3 minutes or so to pick up LTE again.
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Just look at the coverage map, it's obvious turbo isn't indicating just backhaul, as each site has a variable turbo coverage area within spark coverage.
That's not entirely correct. Turbo coverage differs from spark coverage coming from the same cell site.
There are patches of turbo coverage within spark coverage.
Here's a 5 minute video I just took of what optimized B26 looks like at the edge of signal. It beats EVDO, and also rivals 1X.
The "action" starts around 1:40.
The funny thing is since kit Kat, the single band Galaxy Note 3 properly reflects the LTE signal, even in LTE only mode. -120= 0 bars, -115= 1 bar, -110= 2 bars -105= 3 bars -97= 4 bars, -92= 5 bars, -85= 6 bars.
I think speculation is sometime in 2015.
I'm not sure how voice will be handled when roaming on LTE. ECSFB fallback to roaming providers? Or are we waiting for VoLTE?
-Minimum IP67 certified
-Minumim LTE bands: 12/25/26/41
-3X carrier aggregation on B41
-Minimum screen size of 6", maximum of 7".
-Minimum screen resolution of 1080P, maximum of 4k.
-Micro SD card slot, or a minimum of 128GB internal storage.
-Maximum price of US $900
Instant buy to whoever makes it.