Develop Bugs

LTE vs Global GN -- both use SIMS ; differences?

im really lost in the terminology behind all of the different phone standards... umts/hspa/gsm/evdo/1xrtt/lte/wimax/etc etc etc...
Verizon (and Sprint) are CDMA dominant networks. But Verizon LTE requires a SIM-card:
(1) Will a Verizon LTE phone accept a GSM SIM and work at optimal speed? e.g. Vodafone SIM in UK
(2) Conversely, can't the "Global/GSM" Galaxy Nexus take the Verizon LTE SIM and work on Verizon's network?
(3) Is the Verizon LTE's version of Galaxy Nexus a hybrid CDMA-GSM phone (like Sprint's Photon) ... i.e. if I get it unlocked, I could also use it with most international services?
The unlocked global GN is 750$. But if Verizon's contract price is 300+200 [term. fee]... AND it works internationally... clearly its the way to go

1 - No.
2 - No.
3 - No.
You're confusing SIMs for radios. Each phone has a different radio that can connect to EITHER GSM (UK model) or CDMA (USA model). The GNex cannot connect to both.
The GSM version will work in the US with a T-Mobile or AT&T SIM card on a GSM network. You can also take it on international trips (changing SIMs or roaming), as most of the world uses GSM.
The CDMA (Verizon LTE) version will work on Verizon only.

[Q] Differences in Carrier Units?

I noticed that Amazon has the AT&T variant of the LG G3 up and I was curious if anyone knew the differences between them. I assume there will be bloatware for each specific carrier, but, excluding Verizon, would the AT&T variant be harder to root? Would one specific carrier variant get custom roms while the others are left behind?
Sorry for the noob questions, I'm just not 100% familiar with Android devices sold by a specific carrier.

also, is it safe to assume that I could put a t-mobile sim card in the AT&T variant and it will connect to the t-mobile network? since they're all 851 variants

Enddo said:
also, is it safe to assume that I could put a t-mobile sim card in the AT&T variant and it will connect to the t-mobile network? since they're all 851 variants
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Surprisingly yes, there's a minimum of difference in supported bands according to the FCC. AT&T's website indicates their model (D850) supports 2100 Mhz HSPA rather than AWS, but they probably meant AWS. Basically they have the same 2G, 3G, and HSPA+ frequency support
T-Mobile's (D851) is missing Band 5 LTE, which AT&T has deployed here and there, but that appears to be the only difference in frequency support. Both devices have LTE Bands 2, 4 and 17 (AWS, PCS, and 700 MHz blocks B and C respectively), so the main US LTE bands are covered.
You would have to unlock the device first, of course.

4g

I have a HTC One M8, t-mobile, rooted ,s-on , unlocked sim , new sim for 4g ...but I don't have 4g, only 2g, what should I do ... I live in europe albani

You should find out what frequency bands your carrier uses and match that up with what your phone has.
Chances are you have a phone that does not support your carriers 4g bands and its reverting back to the more basic 2 g stuff.

IAmSixNine said:
You should find out what frequency bands your carrier uses and match that up with what your phone has.
Chances are you have a phone that does not support your carriers 4g bands and its reverting back to the more basic 2 g stuff.
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any idea how to add bands ? for t mobile ??

AT&T m8

Will I lose any lte band support if I convert to tmobile?

Yes, flashing T-Mob US (I assume you mean US, since you are talking AT&T) firmware or RUU will change band support, and you will lose some LTE bands.
According to the specs on GSMarena, with the T-Mob firmware, you will have support for LTE bands 4 and 17; and will lose support for 2, 5, and 7.
What bands do you need, and what carrier are you using?

Tmo USA
What if I merely flash a tmobile based rom

PunishedSnake said:
Tmo USA
What if I merely flash a tmobile based rom
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Just flashing the ROM, you won't change the band support.
But again, I'm curious what carrier you are actually using the phone on?

redpoint73 said:
Just flashing the ROM, you won't change the band support.
But again, I'm curious what carrier you are actually using the phone on?
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Tmobile USA
I installed insertcoin and used the tmobile setting hopefully it works

PunishedSnake said:
Tmobile USA
I installed insertcoin and used the tmobile setting hopefully it works
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Click to collapse
Should work fine.
Being on T-Mob US, and using AT&T radio baseband (part of the firmware that determines band support) should be fine for the most part. Reason I say this is:
1) ATT radio supports the same LTE bands as the T-Mob radio (4 and 17), and then some.
2) ATT radio is missing HSPA (3G) Band 4 (AWS). This used to be the band most widely used by T-Mob for 3G. But my understanding, is that they are well underway in migrating 3G service to 1900 MHz (Band 2) which is supported by the ATT radio.
3) The only "negative" to staying on the ATT radio, that I can see, is that if you happen to be in area where T-Mob is still using AWS for 3G , and you don't have LTE service in that area, either. In that instance, your data will drop down to EDGE (2G). I don't really have an idea of how widespread this situation may be; but I have a feeling its relatively small.

redpoint73 said:
Should work fine.
Being on T-Mob US, and using AT&T radio baseband (part of the firmware that determines band support) should be fine for the most part. Reason I say this is:
1) ATT radio supports the same LTE bands as the T-Mob radio (4 and 17), and then some.
2) ATT radio is missing HSPA (3G) Band 4 (AWS). This used to be the band most widely used by T-Mob for 3G. But my understanding, is that they are well underway in migrating 3G service to 1900 MHz (Band 2) which is supported by the ATT radio.
3) The only "negative" to staying on the ATT radio, that I can see, is that if you happen to be in area where T-Mob is still using AWS for 3G , and you don't have LTE service in that area, either. In that instance, your data will drop down to EDGE (2G). I don't really have an idea of how widespread this situation may be; but I have a feeling its relatively small.
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Yea thats why I got an unlocked ATT m8 instead of a tmobile one for the extra lte bands. I have yet to run into band 2 lte and all the aws hspa has been reused for lte. Luckily.

Why so hard to use with verizon?

I've tried reading a lot on multiple sites for a while now and see people saying you can put it on Verizon and other saying you can't. I've got the phone rooted and it's working on T-Mobile but I really want to put it on Verizon even if it loses some functionality maybe. Do I just need to flash s7 firmware now?

Verizon doesn't really use the same frequencies as they are a CDMA network and ATT/TMob is GSM.

themaxx69 said:
I've tried reading a lot on multiple sites for a while now and see people saying you can put it on Verizon and other saying you can't. I've got the phone rooted and it's working on T-Mobile but I really want to put it on Verizon even if it loses some functionality maybe. Do I just need to flash s7 firmware now?
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This device is an AT&T exclusive so it was built to function on AT&T's bands and services. The phone, when unlocked is easy to use on T-Mobile, or any of AT&T or T-Mobile's MVNO's such as Cricket or Metro as both use the same 3G tech, T-Mobile uses the 2G tech AT&T used to use and both use bands 2,4 and 12 on 4G LTE. However, Verizon uses entirely different 2G and 3G technology based on CDMA compared with AT&T/T-Mobile's GSM. Verizon does use bands 2 and 4 on 4G LTE so this phone may, in theory, be able to connect to Verizon 4G LTE on those two bands. However much of Verizon's LTE service is on a low-frequency band numbered 13 that is not accessible by Galaxy S7 Active. I don't think Verizon will permit this phone to register on the network even on Bands 2 and 4.