Database Users

CDMA

I was reading that setting your phone to CDMA helps improve battery life. I was wondering what CDMA is and how do I set it to that?
Sent from my Liberty CM7

From what I understand CMDA is a network type not something you can change if you changed that setting your phone would no longer communicate with your carriers towers.
Sent from my SCH-I500 using XDA App

cpfeifer said:
From what I understand CMDA is a network type not something you can change if you changed that setting your phone would no longer communicate with your carriers towers.
Sent from my SCH-I500 using XDA App
Click to expand...
Click to collapse
So its basically killing data?
Sent from my Liberty CM7

syed239 said:
So its basically killing data?
Sent from my Liberty CM7
Click to expand...
Click to collapse
It's killing radio. Like airplane mode. And wont work in CDMA networks as it lacks the hardware needed.

Lol I'd love to know where you heard this.
http://en.wikipedia.org/wiki/GSM
http://en.wikipedia.org/wiki/Code_division_multiple_access
Print these out and read next time you're on the ****ter.
Sent from my Liberty using XDA App

I thought CDMA was 3G. I have GSM and WCDMA. GSM is edge. Which uses less battery life, 3G use gives you less battery time. I may have it backwards. But I don't think so.
Sent from my HTC Liberty using XDA App

crispcat89 said:
I thought CDMA was 3G. I have GSM and WCDMA. GSM is edge. Which uses less battery life, 3G use gives you less battery time. I may have it backwards. But I don't think so.
Click to expand...
Click to collapse
WCDMA aint the same as CDMA. WCDMA = UMTS = HSPA (HSDPA+HSUPA) = 3G (ok, not equal, but let's keep it simple). GSM = GPRS = EDGE = 2G. CDMA = Other kind of 2G, EVDO = Other kind of 3G.
That should summarize it all.

Darius_bd said:
WCDMA aint the same as CDMA. WCDMA = UMTS = HSPA (HSDPA+HSUPA) = 3G (ok, not equal, but let's keep it simple). GSM = GPRS = EDGE = 2G. CDMA = Other kind of 2G, EVDO = Other kind of 3G.
That should summarize it all.
Click to expand...
Click to collapse
yeah, w/e guy. anyway, i got the battery **** correct, using your aria set to gsm/2G, gets better battery life.
this has all the stuff about 2G
http://en.wikipedia.org/wiki/2G
*edit, i was correct in my first post. about gms being edge, which is still 2G

crispcat89 said:
*edit, i was correct in my first post. about gms being edge, which is still 2G
Click to expand...
Click to collapse
That's exactly what he said lol...cdma is not 3g ttho fron my understanding of things
Sent from my Liberty using XDA App

In short, all AT&T phones are GSM because the cell tower configuration AT&T uses. Verizon phones, for example, are CDMA because they use a different tower configuration than AT&T, thus why Verizon phones can't work on AT&T. Have you noticed how the new Verizon iPhone had to be slightly readjusted to add extra antenna notches in the corner's that the AT&T iPhone did not have? This is so the Verizon iPhone can be compatible on Verizon's CDMA network.

Yeah ATT uses GSM, it is a newer technology than CDMA

mobile term madness

FYI: while setting your phone to GSM/2G will save battery, you will not be able to use data and voice simultaneously (without wifi anyway) just like Sprint and Verizon users. Maybe no big deal, but happens to be a feature I can't live without.
Sent from my Liberty using XDA App

att 4g

I'm not familiar with how cell data connections work. Will the new att 4g work with an x10i, using hsdpa?

HSPA is touted as 3.5g, if I am not wrong...
Usage of 4G would require an LTE-able phone, like the new HTC thunderbolt.
I'm not a pro at cellular networks too, just sharing my understanding through what I have read around the web.

t3ej4y said:
Usage of 4G would require an LTE-able phone, like the new HTC thunderbolt.
Click to expand...
Click to collapse
4G and LTE are not the same thing. From what i've read, LTE is more like 3.9G

lansingone said:
I'm not familiar with how cell data connections work. Will the new att 4g work with an x10i, using hsdpa?
Click to expand...
Click to collapse
HSPA+ and LTE are both part of AT&t's 4G plan. You need a 4G capable phone to get either, X10 will not work.

I work in the cellular world. The understanding of 4g vs lte can be hard to grasp. Think of LTE as (long term evolution). companies like Verizon and AT&T won't have to invest much additional to the development of 4g or the expansion into what the next level will be. The LTE platform is designed to grow and stretch with the demand.
Sent from my X10i using XDA App

Android 2.3.4 on Sprint's Nexus S

Is that is updated Gingerbread or it is just because Nexus S 4G has a different hardware then Nexus S?
http://www.bgr.com/2011/03/23/hands-on-with-sprints-nexus-s-4g/

The baseband is newer I think as is the build number?? perhaps one of our more technical members can confirm?
Interesting.....

The build seems to be newest...
GRI40 or GRI54 in 2.3.3 and this is GRI75

Probably to add wimax support, also epst settings maybe all cdma phones have that
Sent from my PC36100 using XDA App

It would make sense that the baseband and build are different. After all, the radios for Sprint, both 3g and 4g, are completely different technologies than what we have in our plain Nexus S phones.
That also begs the question: If you're not in a Sprint 4g area, or are in an area where coverage is crappy, can you use data and voice simultaneously over the 3g? This is a common CDMA problem. I'm thinking you cant. Sucks to be those guys...

nickmv said:
It would make sense that the baseband and build are different. After all, the radios for Sprint, both 3g and 4g, are completely different technologies than what we have in our plain Nexus S phones.
That also begs the question: If you're not in a Sprint 4g area, or are in an area where coverage is crappy, can you use data and voice simultaneously over the 3g? This is a common CDMA problem. I'm thinking you cant. Sucks to be those guys...
Click to expand...
Click to collapse
No - AFAIK there's only one phone that supports simultaneous voice and data over EVDO and that's the Thunderbolt. Normally the phones drop to 1xRTT when a call is initiated (at which point data says goodbye).

nickmv said:
It would make sense that the baseband and build are different. After all, the radios for Sprint, both 3g and 4g, are completely different technologies than what we have in our plain Nexus S phones.
That also begs the question: If you're not in a Sprint 4g area, or are in an area where coverage is crappy, can you use data and voice simultaneously over the 3g? This is a common CDMA problem. I'm thinking you cant. Sucks to be those guys...
Click to expand...
Click to collapse
On cdma 3g only no voice and data at the same time. Wifi data and calling works.
Sent from my PC36100 using XDA App

U can't use data and voice at the same time on cdma?
Sent from my Nexus S

Nope
10/char

Nope unless you use WiFi or
4G man I can't wait to get this phone
Sent from my PC36100 using Tapatalk

jgalan14 said:
Nope unless you use WiFi or
4G man I can't wait to get this phone
Sent from my PC36100 using Tapatalk
Click to expand...
Click to collapse
Me too, and for four hundred off contract just the extra icing on the cake
Sent from my PC36100 using XDA App

krohnjw said:
No - AFAIK there's only one phone that supports simultaneous voice and data over EVDO and that's the Thunderbolt.
Click to expand...
Click to collapse
Not entirely true. All of Sprints WiMax phones do as well. EVO, Samsung Epic, etc.

icase81 said:
Not entirely true. All of Sprints WiMax phones do as well. EVO, Samsung Epic, etc.
Click to expand...
Click to collapse
No they do not..THERE IS NO SPRINT PHONE THAT SUPPORTS SIMULTANEOUS VOICE AND DATA OVER 3G EVDO. Only over wifi or 4g wimax.
For now, only VZW's Thunderbolt does voice and data over 3G EVDO in regards to CDMA.

Yep tmobiles version gets me 6mbps download and 1.5 upload anyways. Id say try in your area before you buy 2.3.4 is not a os change really
Sent from my Nexus S using XDA App

LordLugard said:
No they do not..THERE IS NO SPRINT PHONE THAT SUPPORTS SIMULTANEOUS VOICE AND DATA OVER 3G EVDO. Only over wifi or 4g wimax.
For now, only VZW's Thunderbolt does voice and data over 3G EVDO in regards to CDMA.
Click to expand...
Click to collapse
That's correct and the Thunderbolt uses SVDO not EVDO which is what allows simultaneous data and voice.

jlevy73 said:
That's correct and the Thunderbolt uses SVDO not EVDO which is what allows simultaneous data and voice.
Click to expand...
Click to collapse
Thanks for the additional info.

I don't know if Sprint is waiting for their Network Vision/1X Advanced to be activated on a few select markets later this year, but they have pre-production phones with the SVDO chipset.

from what i heard there are some system updates and bug fixes, most important is voice chat and video chat is now available in Google talk

Video calling over Gtalk.

VZW's 4G is not reliable for real-time application

I do get good 4G coverage from VZW most of the places I go. But the fact that the coverage is not 100% makes it useless for real-time application. This morning I was on a conference call using Skype dialing a regular phone number. In 30 minutes the call dropped twice, both due to I drove through a spot with no 4G coverage. As the phone switched from 4G to 3G the Skype connection was cut momentarily and the call dropped. On my OG Droid X on 3G this rarely happens.
I wish the phone handles switching from 4G to 3G more gracefully. Now I'll have to remember to turn off 4G when I start a Skype call. Quite annoying.
Any idea how to fix/workaround this?

This and failed text messages are the reason I left Verizon. ATT's 4G LTE is much boarder in cities and when you leave LTE areas then you fall back to HSPA+.
Sent from my SAMSUNG-SGH-I747 using xda premium

to each his own...
I have phones on AT&T and Verizon Wireless networks (one for work and one for play). I've consistently had better phone experience in the DFW areas as well as places I've traveled to on both coasts.
Consumer Reports article about AT&T being lowest in customer satisfaction.

Well sprints is great.
Sent from my SPH-L710 using Tapatalk 2

saccityp said:
Well sprints is great.
Sent from my SPH-L710 using Tapatalk 2
Click to expand...
Click to collapse
Except for almost the whole US except for a couple states has 3G.

I have a Blackberry on AT&T for work and the S3 and a Razr Maxx on Verizon.
In Dallas, there is no comparison that Verizon is better- never a dropped call, and data reliability is outstanding compared to AT&T.
I've had AT&T since before they existed as AT&T and their analog, GSM, Edge, 3G have never held up well in either voice or data in my 10-11 year's of experience with them in the DFW market.

luckily I live in an area were I always have 4g
Sent from my SCH-I535 using xda app-developers app

saccityp said:
Well sprints is great.
Sent from my SPH-L710 using Tapatalk 2
Click to expand...
Click to collapse
Sprint's WiMax also unfortunately had this issue. The reason was because when your phone switches from 4G to 3G, your IP address changes thus ending any active connections. This was especially bad for WiMax since it was on 2.4Ghz making it have very spotty coverage.
I'm not sure if it's possible to retain the IP from a switch or if Sprint does this with their LTE network.

In my area, VZW is only LTE and has better signal than any others... guess I don't have any choice...

I love Verizon's Service. LTE is on point here in Orange County CA and I get consistently better service than anyone without it. My only concern is with the phone itself. It keeps freezing on the data side once to twice a day. I just have to turn off and then turn on mobile data to get it to work.

Thanks for all the info about coverage of different carriers. The point of my post/question though, is that when there's not a 100% 4G coverage, the data connection is disrupted when you switch from 4G to 3G, causing trouble in any application that requires a stable data connection.
Seems even if the 4G coverage is not 100%, there should be a better way of handling switching to 3G such that it doesn't drop data completely.

simollie said:
Thanks for all the info about coverage of different carriers. The point of my post/question though, is that when there's not a 100% 4G coverage, the data connection is disrupted when you switch from 4G to 3G, causing trouble in any application that requires a stable data connection.
Seems even if the 4G coverage is not 100%, there should be a better way of handling switching to 3G such that it doesn't drop data completely.
Click to expand...
Click to collapse
There's nothing you can do about it but the carriers can fix it.
The solution would be to keep the same IP address when switching from 3G to 4G. The reason video calls in skype, browser downloads, and other things stop is because the IP address changes when switching. If the same IP address was kept from the switch, that wouldn't happen.
One thing that carriers could do when connecting to 4G is: Have your phone connect to both 3G and 4G at the same time and then request the same IP for 4G that you had on 3G. Then it can switch to 4G and switch off the 3G connection thus retaining the same IP and leading to no interruptions. All of this would happen in probably less than a second. The same thing can be done for switching from 4G to 3G.
I don't see why carriers can't/don't do this. Either they haven't thought to implement it, or there is some other reason that would make this impractical.

OTA update causing data to step down to H

Anyone else notice after the update, during calls your data will force down to H from LTE? Same issue with Nexus 5 and 6p.

divinewisdom said:
Anyone else notice after the update, during calls your data will force down to H from LTE? Same issue with Nexus 5 and 6p.
Click to expand...
Click to collapse
Not an issue. Is a feature so that you can get better reception for your phone call.
Sent from my Nexus 6P

anglerstock said:
Not an issue. Is a feature so that you can get better reception for your phone call.
Sent from my Nexus 6P
Click to expand...
Click to collapse
Not true. LTE is the better reception for calls. Look up the difference in technology.
As for why and if the latest update drops when making calls... I haven't seen it myself so I can't comment.

obsanity said:
Not true. LTE is the better reception for calls. Look up the difference in technology.
As for why and if the latest update drops when making calls... I haven't seen it myself so I can't comment.
Click to expand...
Click to collapse
Can you disconnect from WiFi, see if you get LTE, then make a call see what happens. This is after the latest update today.

obsanity said:
Not true. LTE is the better reception for calls. Look up the difference in technology.
As for why and if the latest update drops when making calls... I haven't seen it myself so I can't comment.
Click to expand...
Click to collapse
2g gives better reception than 3g, 3g better than 4g and so on. LTE gives faster data speed but if you want better reception 2g it is.
Sent from my Nexus 6P

Which carrier. Unless you have VOLTE that has always happened.

I noticed the same thing on ATT. During a phone call the phone drops to H. This is not normal, my nexus 5 remains on LTE since I didn't upgrade that phone.
Curious if there's a fix for this.

divinewisdom said:
Can you disconnect from WiFi, see if you get LTE, then make a call see what happens. This is after the latest update today.
Click to expand...
Click to collapse
While in a call I'm still on LTE. Yes I'm on the latest update.
---------- Post added at 08:56 PM ---------- Previous post was at 08:48 PM ----------
anglerstock said:
2g gives better reception than 3g, 3g better than 4g and so on. LTE gives faster data speed but if you want better reception 2g it is.
Sent from my Nexus 6P
Click to expand...
Click to collapse
I think you got it backwards. It may be true that in some areas 2G may give you a better signal strength than 3G but that has nothing to do with technology and the amount of data which can go through and that includes calls (yes calls are also data and has been for many years since it all went digital).
LTE is just another, newer standard of GSM for calls, text, data and so on.
Also, VoLTE is not the same as VoIP.

Not had any issues from the uk. I generally get 4g. The radios on this phone far suprass the ones on my old xperia Z2.
Anyway didn't i see a post saying that the update disabled a certain band for T-Mobile? Maybe it's to do with that

hal752 said:
Not had any issues from the uk. I generally get 4g.
Click to expand...
Click to collapse
Did you read the thread?
The only network in the UK that supports VoLTE (calls while you are on a 4G network) is Three and they don't sell or support the Nexus 6P, so you certainly haven't been getting 4G while you are on a call.

Plain LTE does not support voice, it is only for data. When your phone receives a call it will automatically use H/3g or even 2g for your voice call. Unless your operator supports Voice over LTE (VoLTE)!
Sent from my Nexus 6P using Tapatalk

Same thing. Though voice doesn't use LTE always. LTE is just for data.

mkouk said:
Plain LTE does not support voice, it is only for data. When your phone receives a call it will automatically use H/3g or even 2g for your voice call. Unless your operator supports Voice over LTE (VoLTE)!
Sent from my Nexus 6P using Tapatalk
Click to expand...
Click to collapse
I'm not sure you guys understand how LTE works and what it is supposed to do. LTE is just another standard which is better than the old GSM type 3G. It's just that carriers chose to use it only for data because the entire infrastructure was already designed to work on 3G for voice. The transition to full LTE system is taking a bit long but watch when next year Verizon shuts down all 3G CDMA equipment and goes LTE only on the entire network.
T-Mobile will most likely follow along with all the others.

obsanity said:
I'm not sure you guys understand how LTE works and what it is supposed to do. LTE is just another standard which is better than the old GSM type 3G. It's just that carriers chose to use it only for data because the entire infrastructure was already designed to work on 3G for voice. The transition to full LTE system is taking a bit long but watch when next year Verizon shuts down all 3G CDMA equipment and goes LTE only on the entire network.
T-Mobile will most likely follow along with all the others.
Click to expand...
Click to collapse
Please don't spread misinformation. LTE standard only supports packet switching so carriers have been using circuit switched fallback (i.e. 3g) for regular calls and we are now seeing operators moving to VoLTE.
Also LTE is based on GSM!
Sent from my Nexus 6P using Tapatalk

mkouk said:
Please don't spread misinformation. LTE standard only supports packet switching so carriers have been using circuit switched fallback (i.e. 3g) for regular calls and we are now seeing operators moving to VoLTE.
Also LTE is based on GSM!
Sent from my Nexus 6P using Tapatalk
Click to expand...
Click to collapse
I'm not sure where the misinformation is.
The argument here is that the older systems are somehow better at voice than LTE is and one gets a better signal with 2G for being able to make a call. This is simply not true. LTE supports voice with the implementation of VoLTE and is much superior at handling it. More capacity, clearer calls and better quality calls with much weaker signal strength.
Again, carriers chose to implement it as data only because of many older handsets still out there using 2G/3G. But this will not be for long because LTE is much more efficient which spells $$$ for carriers. Verizon has already started turning off their legacy CDMA system on some towers.
Also, when did I say LTE was not based on GSM?
https://en.m.wikipedia.org/wiki/VoLTE