Some phones support the 1700/2100 frequency band 4 on lte technology but say they don't have support for the 1700/2100 umts technology. They are the same band and frequency right so why don't they say they can work on umts and lte for the 1700/2100 band? Are the signals for those bands separate from the technology, gsm umts or lte? This is mainly for Verizon phones. Also for phones that have different variants of frequency support are they different in hardware or on a software/firmware level?
Why do certain phones support just specific bands for each technology, gms/lte/umts and the like? I don't see why the phone cannot just recieve signals from a range of frequencies then usuing different technologies to read the frequencies at each level. Like some phones support the 1700/2100 lte band but don't support the 1700/2100 on umts/gsm? Are the phones just locked for the different frequencies on those technology due to corporations?
The North America LTE version supports band 4 for LTE but only in the 1700MHZ range. Much of T-Mobile's network apparently operates in the 2100MHZ range. The International LTE variant supports 2100MHZ.
The question is this: has anybody figured out if it's possible to enable the radio to utilize 2100MHZ (and how)? ... or is it truly a hardware limitation of the North American model?
Thanks!
Dear All Experts,
Can anyone tell, why we are not having a toggle or checkbox for supported frequency for any UI. I understand from the docs of MediaTek & Qualcomm that same chipset supports multiple bands but unfortunately the frequency supported of two different vendor is different. this proves the support of frequency for a phone is decided on the region it is released. so its all with the driver of modem which decides. can we or do we have an alternate solution to this.
For eg.
I see lenovo VIBE Z2 pro does not have Band 40 LTE support. is there any hope!!!
Kindly give some explanation for the judgement with some reference.
Integrated 4G LTE Advanced World Mode, supporting LTE FDD, LTE TDD, WCDMA (DC-HSUPA), CDMA1x, EV-DO Rev. B, TD-SCDMA and GSM/EDGE
CAT4 speeds of up to 150 Mbps with support for up to 2x10 MHz carrier aggregation
3rd Generation integrated LTE modem, with support for LTE-Broadcast and LTE multimode dual-SIM (DSDS and DSDA)
RF 4th gen power efficient LTE multimode transceiver with Qualcomm RF360™ Front End solution for world mode bands, lower power and PCB reduction
As the topic states, is there any way to use the Nexus 5 (D821) on the Sprint Network in the US?
I had a broken phone so I bought this nexus 5 thinking that regardless of the difference between the two, the radio should still be compatible with it since it is supposed to be a world phone. I just recently realized that the radios are different (apparently the D821 isn't allowed to use CDMA bands).
I know there is the Nexus Field Test APK, but I don't think that would enable those CDMA bands.
I won't be back in the states for another three months, and at that point, my service contract would end with Sprint, so I could either buy a new phone, or go to another carrier (maybe T-mobile, or any pre-paid provider) and shop around.
But, as for my question, is there any way to get the D821 to use the Sprint Network?
See below.
Elluel said:
GSM networks are the exact same on either device
Some NA carriers use CDMA instead of GSM for 2G. A D821 won't be able to get 2G from those NA carriers that use CDMA, a D820 will get 2G anywhere in the world on either GSM or CDMA.
D820's extra band 19 on WCDMA is pretty much negligible
Some LTE bands are shared, but most are different. If you're lucky/pre-searched before choosing a carrier, you can get a D820 to work elsewhere/D821 to work in NA on LTE if the carrier happens to use one of the LTE bands that are shared between the D820 and D821.
D820:
GSM: 850/900/1800/1900 MHz
CDMA: Band Class: 0/1/10
WCDMA: Bands: 1/2/4/5/6/8/19
LTE: Bands: 1/2/4/5/17/19/25/26/41
D821:
GSM: 850/900/1800/1900 MHz
WCDMA: Bands: 1/2/4/5/6/8
LTE: Bands: 1/3/5/7/8/20
Also, it has been proven possible to enable LTE band 3 & 8 on the D820, as well as band 2 & 4 on the D821 with modifications, which could make your D820 work on more non-NA carriers, and your D821 work on more NA carriers. (http://forum.xda-developers.com/google-nexus-5/general/radio-enable-lte-band-3-nexus-5-d820-t2928561)
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Elluel said:
See below.
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So there is no software enabled modification that I can use that will enable the CDMA bands (not the LTE bands) to be used on a D821?
I know of that forum link at the bottom of the post, but, as far as I know, CDMA is required before the use of LTE on Sprint.
slixzen said:
So there is no software enabled modification that I can use that will enable the CDMA bands (not the LTE bands) to be used on a D821?
I know of that forum link at the bottom of the post, but, as far as I know, CDMA is required before the use of LTE on Sprint.
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The D821 lacks CDMA support completely.
As far as I know, Sprint uses bands 25, 26 and 41 for LTE so the D821 has no way to get LTE either.