[Verizon Motorola Droid Turbo General] ChazzMatt:
I answered this via PM, but I'm also going to post here so others can see it.

It's a situation of Good News, Bad News...

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GOOD NEWS:

Both the FCC tests on this phone and QSPT/mzTool show WCDMA/UMTS/HSPA/HDSPA Band 4 - 1700 is enabled. I know this is glossing over some things, but for the purposes of this discussion WCMDA is UMTS is HSPA is HDSPA. You will see specs on one site say WCDMA (not CDMA) and on another call it UMTS and on others call it HSPA or even HDSPA, when they are really all taking about the same phone.

When Motorola sent the phone to the FCC, they declared it was electronically equivalent to the Droid Turbo is these areas:

But the FCC found more. ;)

See, the WCDMA Band IV? It's there. When this phone went through the FCC, they found TWO GSM bands, THREE WCDMA bands, and FIVE LTE bands.

Then when actually released -- with the SAME FCC ID number , in the official specs, Motorola now shows FOUR GSM bands, FOUR WCDMA bands and FIVE LTE bands (but LTE band 3 instead of LTE band 5).

However, as mentioned before QXDM/NV Browser shows LTE band 5 is still there. (QXDM/NV Browser shows LTE bands).

This is not unusual. In 2012, Apple had two unmentioned LTE bands enabled on the AT&T iPhone.

The FCC number is important because this phone is sold in Puerto Rico, which is U.S. territory. In Brazil or Mexico or Chile, the FCC has no authority -- but in Puerto Rico the FCC does have authority. Motorola can't change out any hardware without recertification. And this FCC number is on ALL the Moto Maxx phones being sold in all countries.

Anyway, just as QXDM/NV Browser shows LTE band 5 is still there, QPST/mzTool shows WCDMA (UMTS/HSPA/HDSPA, whatever you want to call it) Band 4 (1700) is still there. (mzTool only shows 2G/3G bands.)

WCDMA/UMTS Band 4 was there in the FCC tests and mzTool shows it's still there.

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BAD NEWS:

Under the mzTool, the Moto Maxx shows these 2G/3G bands (which includes UMTS):

Here's the problem:

Motorola official specs show THESE bands for 2G/3G for this XT1225 "Moto Maxx":

For 2G (GSM) bands, both QPST/mzTool and Motorola list 850, 1800, 1900. I guess 900 = GSM extended band -- whatever that means. So, everyone agrees.

But for the 3G (WCDMA, UMTS, HSPA, HDSPA, whatever you want to call it) bands, all sources agree on 850, 1900, 2100. Where they disagree is mzTOOL scan says this phone has Band IV 1700 (exactly what you are looking for), while Motorla says it has 900, which seems would be WCDMA Band 8? But Motorola does not mention UMTS 1700 (band 4).

Now it's one thing to have LTE band 5 enabled which are not in the official specs... (As I said, Apple did it in 2012 with the iPhone -- they had TWO more LTE bands enabled not mentioned in their official published specs at time of release. For this phone, LTE band 5 was present in the FCC tests, so there's independent corroboration to the QXDM/NV Browser software scan results.)

But it's another thing to completely leave out a UMTS band the manufacturer lists in the official specs and replace it with a different band. I asked in the forum if anyone had an explanation for the mzTool results. No one answered.

So, either mzTool is confusing WCDMA band 4 for WCDMA band 8 -- OR WCDMA band 4 is still there, but for some reason mzTool is unable to see WCDMA band 8 (which Motorola claims).

Now in mzTool, with a rooted phone you can check off all the 2G/3G bands you wish to enable. But the hardware (modem, radio) and firmware have to support those bands for it to work. For instance, a lot of people have tried to enable LTE band 20 for Europe, using the QXDM/nvbrowser and although the software shows it's enabled, no one in Europe has actually gotten reception on LTE band 20 on this phone. It must not support it. Since LTE band 5 was there in the FCC tests and it's the same FCC ID number, I KNOW LTE band 5 would be supported. Until I actually got into QXDM however, I didn't know it was already enabled. I was going to all this trouble to enable it! (AT&T doesn't yet use LTE band 5 in Atlanta metro area, but I wanted my phone to have all AT&T capabilities.)

However, even if UMTS band 4 is not there, it was definitely there during the FCC tests and could probably be enabled by mzTool.

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BOTTOM LINE:

WCDMA/UMTS band 4 (1700) was there during the FCC certification and mzTool says it's still there, just as LTE band 5 was there in FCC tests and is still there.

The only thing that concerns me is mzTool does not show the other UMTS band which Motorla claims is there (900). I have no answer for that.

In spite of all this, if for some reason UMTS band 4 is not enabled out of the box, it most probably can be enabled in mzTool (after root) and we know the hardware/firmware supports it (from the FCC tests).