[Verizon Motorola Droid Turbo Q&A, Help & Troublesh] ChazzMatt:
The Droid Turbo XT1254/U.S. Moto Maxx XT1250 (same identical device, same FCC ID) does not have all the AT&T bands. AT&T uses LTE bands 2, 4, 5, 17.

Only the "international" Moto Maxx XT1225 & Moto Turbo XT1225 has all the AT&T bands. The XT1225 has a different FCC ID from the XT1254/XT1250 -- has no CDMA bands, but has more HSPA bands, and a different mix of LTE bands (bands 5 and 7, but no band 13). The radios between the XT1250/XT1254 and the XT1225 are not compatible, so you cannot flash one over the other.

You CAN use the Droid Turbo/U.S. Moto Maxx on AT&T, but you will not have LTE bands 5 and 17. Here in the Atlanta area, LTE band 17 is used extensively. You would only have LTE bands 2 & 4. For AT&T, you would be missing LTE bands 5 & 17. Which means you would drop down to HSPA (3G) in those areas where 2 & 4 were not available. In metro Atlanta, if I had the Droid Turbo on AT&T I would be on LTE band 2 half the time (north of Atlanta) and HSPA the rest of the time (in Atlanta, and south), since it doesn't have LTE band 17.

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All the Quarks share LTE bands 2, 3, 4, and 7. In the FCC letter it only mentions they share LTE bands 2 & 4, because no U.S. carriers use LTE bands 3 & 7, and the FCC is a U.S. regulatory agency.

Can you "enable" LTE bands 5 & 17 on the XT1254/XT1250?

Conversely, can you enable LTE band 13 on the XT1225?

Theoretically you could, since another Quark model has them... but realistically probably not. Samsung, One Plus, and others manufacturers disable bands not needed on their phones for various regions/carriers -- and by rooting and using modem software (ike QPST/QXDM) people have been able to "enable" additional LTE bands in various Snapdragon phones. The Galaxy S5 in Europe has the bands needed there, and the Galaxy S5 in Latin America has the bands needed there. The bands not needed are disabled via software interface, and by editing that people have been able to create "world" phones with all bands enabled! (Google it.)

The difference in Nexus phones is those bands are NOT disabled. ;)

But that only works if the bands were there to begin with, then disabled by the manufacturer. People have tried to add LTE band 20 (used in Europe) to the Moto XT1225 and were not successful. It would show it was enabled but they could not receive/send any signal on that band. The issue is no Quarks anywhere have LTE band 20, so there's not really an LTE band 20 that can be enabled. Like turning on a light switch that's not connected to anything.

HOWEVER, theoretically, since one variant of Quark has LTE band 13 and the other doesn't, and other variant has LTE band 5 & 17 and the other doesn't, you could create a Quark that had ALL the bands between the two: 2, 3, 4, 5, 7, 13, 17.. But it would depend on if Motorola/Lenovo manufacturer is similar process to Samsung and One Plus. Are all those bands there and they just disable what they don't want? Or do they use completely separate radio firmware for both variants?

I don't have the time or patience to go looking for bands I don't need. I did all the band enabling stuff earlier before Motorola admitted the XT1225 had LTE band 5 already. :rolleyes:

This is a screenshot of the "3G" bands in QPST. There's similar interface for the LTE bands. But it was a LOT of hassle, and then I found out the XT1225 already had LTE band 5. It was in the FCC tests, but not in the official specs when first released. Only MONTHS later when the XT1225 was released in India (under the Moto Turbo name) did Motorola finally put LTE band 5 in the specs.