I know the Thunderbolt was capable of this...so can this great developers phone run 3g or 4g while on a call? It would seem to me like if the Thunderbolt could, it's a phone not carrier issue. And if this can't be done, please school me in why. Thanks!
The thunderbolt took advantage of eHRPD which allowed it to use voice and data simultaneously.. I have no idea if the Galaxy Nexus does as I've since moved to T-Mobile.. it should though
It won't. The Thunderbolt and Rezound have unique radios.
3g and LTE are on one radio, and voice and 1x? are on the other.
This allows for svdo.
On the Nexus, 3G and voice are on one radio and LTE is on another. At least, thats how its been explained to me.
Edit: When I say won't, I mean won't do 3g while on a call.
Yea using LTE I'm able to be on a call and surf the net. I was on a conference call the other day while out in the field and Googling stuff in reference to the call.
I haven't tried 3G but probably not.
LTE EX Galaxy Nexus CM9
Asus Transformer Revolver
adrynalyne said:
It won't. The Thunderbolt and Rezound have unique radios.
3g and LTE are on one radio, and voice and 1x? are on the other.
This allows for svdo.
On the Nexus, 3G and voice are on one radio and LTE is on another. At least, thats how its been explained to me.
Edit: When I say won't, I mean won't do 3g while on a call.
Click to expand...
Click to collapse
wow, never even knew this. I always figured manufacturers stuck to 3g/voice on one radio because it was probably so much cheaper. I wish Samsung would have implemented this, would have made life so much easier when on the phone with people. Where I specifically live, its 3g only, but any city in the vicinity is generously blanketed with 4g
Related
I just noticed yesterday that T-mobile has a 4G network in my area and I was wondering if there was a way to force roam 4G on tmobiles network? So that I could pick up 4G.
If its possible how?
Oh and sprint needs to hurry up and put 4g everywhere
You said it yourself. T-Mobile is HSPA+, Sprint 4G is WiMax. So, no.
Naa dude. HSPA+ is not compatible with cdma(sprint). Matter of fact t-mobile is using 4G now because its "trendy" and everybody else is using it. Their network is closer to 3G in infrastructure. But thats up for debate.
That sucks like hell. There's 4G here I just can't have it. AHHHHHHH!!!
Well if its like 3G I guess I'm not missing much.
david279 said:
Naa dude. HSPA+ is not compatible with cdma(sprint). Matter of fact t-mobile is using 4G now because its "trendy" and everybody else is using it. Their network is closer to 3G in infrastructure. But thats up for debate.
Click to expand...
Click to collapse
You are on the money. HSPA+ is no more than an upgrade to existing 3G technology. If I remember right, it only has a theoretical max of 54 Mbps down. It is not, nor will it ever be, 4G.
Granted, the current 802.16e standard of WiMax is not 4G either...just waiting for that 802.16m standard to be finalized =). Which once that is complete, infrastructure can be updated and we should be able to utilize it with a simple firmware update.
Stalte said:
That sucks like hell. There's 4G here I just can't have it. AHHHHHHH!!!
Well if its like 3G I guess I'm not missing much.
Click to expand...
Click to collapse
No its way faster than your normal 3G. Faster than WIMAX too. Its nothing to pull down 7 or 8 Mb.
I bet it's better on battery than wimax is on ours.
Sent from my PC36100 using XDA App
overthinkingme said:
I bet it's better on battery than wimax is on ours.
Sent from my PC36100 using XDA App
Click to expand...
Click to collapse
It uses the same radio for voice. The EVO has a separate 4G radio thats has to be activated and scan then connect. So 2 radios running at the same time would use more battery than 1 GSM radio running. Also CDMA has a tendency to use more battery when searching for signal in low signal areas.
Having installed T-mobiles 3g upgrade here in Chicago market back in 2008, I can say definitively that HSPA is just a radio cabinet addition to the existing cellular framework. Depending on the layout of the tower/site, "Flex radios" handle the data on 1, or sometimes more antennae, while the voice travels over GSM through remaining antennae. Very similar to ATT infrastructure, but tiny radios handling big bandwidth.
Having said all that, 4G is a silly buzzword that Sprint started, and T-mobile is now exploiting.
In a way, Sprint is just using extra radios on top of their existing 3G cellular, and just integrating the enhanced data speeds of Clearwire's network into their own.
T-mobile's speeds are indeed fast both HSPA and HSPA+, but to call them 4g may be overstating it, as it is just an upgrade to their existing technology, and not a new technology.
As another poster stated, nobody officially has 4g yet, not even Sprint, and until the 802.16 commission finalizes and LTE is launched we still won't.
To re-emphasize to the OP, not a chance, and don't believe the hype.
I can see sprint(or clear) and T-mobile going to bed for some real 4G'ness.
david279 said:
I can see sprint(or clear) and T-mobile going to bed for some real 4G'ness.
Click to expand...
Click to collapse
Yeah, I heard a rumor that Sprint may eventually adopt LTE.... It makes sense.
Wimax will make a great backhaul, and could stay in place, not to mention supporting cities and rural areas. But LTE will be the big daddy, and similar to WiMax, works on it's own and should be seamlessly integrated on top of cellular.
I'm not sure but I think it can work with CDMA or GSM, hooray for global WiFi!
Mitch Matrixx said:
Yeah, I heard a rumor that Sprint may eventually adopt LTE.... It makes sense.
Wimax will make a great backhaul, and could stay in place, not to mention supporting cities and rural areas. But LTE will be the big daddy, and similar to WiMax, works on it's own and should be seamlessly integrated on top of cellular.
I'm not sure but I think it can work with CDMA or GSM, hooray for global WiFi!
Click to expand...
Click to collapse
I wouldn't count on LTE on Sprint just yet. Hesse denounced it last week; however, Sprint, Clearwire, Google, Time-Warner, and a couple others purchased Spectrum not only in the 2.5 GHz, but the 2.3 GHz band also. So the bandwidth is there and, in the past, Hesse has been quoted saying they can easily switch to LTE if need be.
Edit: http://gigaom.com/2010/10/29/sprint-ceo-dan-hesse-on-clearwire-lte-wimax/
topdawgn8 said:
I wouldn't count on LTE on Sprint just yet. Hesse denounced it last week; however, Sprint, Clearwire, Google, Time-Warner, and a couple others purchased Spectrum not only in the 2.5 GHz, but the 2.3 GHz band also. So the bandwidth is there and, in the past, Hesse has been quoted saying they can easily switch to LTE if need be.
Edit: http://gigaom.com/2010/10/29/sprint-ceo-dan-hesse-on-clearwire-lte-wimax/
Click to expand...
Click to collapse
Thanks for the info.
I think the most important thing in the article is that LTE can happen if necessary.
Sorry for getting off topic.
I don't know when this happened, but on Verizon you can be on the phone and use data at the same time. At&t has nothing on Verizon now.
Sent from my Galaxy Nexus using XDA App
It's 4G voice goes over 3G and data over 4G
EKnofsky said:
It's 4G voice goes over 3G and data over 4G
Click to expand...
Click to collapse
How long have we had these capabilities? This opens a few more doors for me.
Sent from my Galaxy Nexus using XDA App
You can do this on the Thunderbolt in 3G only areas too. I think because HTC used 2 radios or somesuch. The Nexus can not do Data/voice in 3G only areas.
piperat said:
I don't know when this happened, but on Verizon you can be on the phone and use data at the same time. At&t has nothing on Verizon now.
Click to expand...
Click to collapse
4G gives data, 3G does voice. You can do this and its been a feature since the start.
kenyu73 said:
You can do this on the Thunderbolt in 3G only areas too. I think because HTC used 2 radios or somesuch. The Nexus can not do Data/voice in 3G only areas.
Click to expand...
Click to collapse
True. The Thunderbolt has a special radio that does simultaneous voice/data on 3G.
piperat said:
I don't know when this happened, but on Verizon you can be on the phone and use data at the same time. At&t has nothing on Verizon now.
Click to expand...
Click to collapse
Verizon 4G devices still have to use 3G for voice at least until VoLTE is switched on next year. Having two radios always on is part of the reason why the Verizon version has such horrible battery life.
ianwood said:
Verizon 4G devices still have to use 3G for voice at least until VoLTE is switched on next year. Having two radios always on is part of the reason why the Verizon version has such horrible battery life.
Click to expand...
Click to collapse
I hope when 3G is turned off that simultaneous voice/data isnt lost!!
I think there is alot more to it then having two radios on. Isn't 1x a radio? I've never followed radio technology so I really dont know all the details, but I'm pretty sure the 4G radio itself can do voice/data as well as support 3G and 1x as well. I dont think every 4G handset contains both 3G and 4G chips. I may be wrong, but it seems a bit of wasted space!
kenyu73 said:
I hope when 3G is turned off that simultaneous voice/data isnt lost!!
I think there is alot more to it then having two radios on. Isn't 1x a radio? I've never followed radio technology so I really dont know all the details, but I'm pretty sure the 4G radio itself can do voice/data as well as support 3G and 1x as well. I dont think every 4G handset contains both 3G and 4G chips. I may be wrong, but it seems a bit of wasted space!
Click to expand...
Click to collapse
3g for vzw isnt getting shut off for sometime (i think like 2014). its verizons major voice backbone.
1x uses the same chip as 3g and every LTE handset has 2 radios.
kenyu73 said:
I hope when 3G is turned off that simultaneous voice/data isnt lost!!
Click to expand...
Click to collapse
You won't lose it. Voice is treated like just another data type in LTE which means VoLTE inherently supports concurrent voice/data.
Zepius said:
3g for vzw isnt getting shut off for sometime (i think like 2014). its verizons major voice backbone.
1x uses the same chip as 3g and every LTE handset has 2 radios.
Click to expand...
Click to collapse
It's about having radios on at the same time. LTE/UMTS/GSM does not run 2 radios simultaneously and supports seamless in-session handovers including the signaling of mobile terminated calls (LTE release 9). It is almost effectively the same as concurrent voice and data in UMTS/GSM. In LTE/CDMA you run both radios concurrently unless you turn LTE off.
This is something I just discovered the other day and it kinda bugged me out cause as far as I knew data while on voice wasn't possible on CDMA.. But I was inside a cafe getting lunch, and while on the phone I had to look up something on ticketmaster and was amazed that I was actually able to surf the web while on the phone. I have had blackberries, WM phones and an Evo prior to this and it was never possible (unless on wifi) I'm in NYC so there is no LTE available yet.. Has anyone who is in a non-LTE market able to do this?
I've seen this mentioned before by some others. Here's a link to one such thread.
http://forum.xda-developers.com/showthread.php?t=1764756
Thanks! When I saw this I kissed my phone, LOL.. But really this is why this phone is so damn amazing.. It makes it so much easier to quickly look something up then to have to say "lemme look this up real quick I'm gonna call you back".
Yep it's great isn't it. The newer phones on Sprint or at least Galaxy 3 and Evo LTE are svdo capable aka simultaneous voice and data. Thank God cdma networks can now do this (Sprint, Verizon) as the gsm networks (TMobile, and AT&T) have been able to do this for a long time.
Sent from my SPH-L710 using Tapatalk 2
Yup! And don't forget the LG Viper it was the first LTE phone to bring the feature. Kinda messed up the Galaxy Nexus is the only LTE phone that don't support it.
yeah, I found this out today and I about screamed out of joy!. I was downloading G Maps and had to call my wife, so I called her and realized the 3G icon didn't go away, like it does on the Epic 4G (my last phone). And I had to tell my wife "hold on" and went back to my notifications and realizeed GMaps was still downloading. What a great feature on a CDMA phone. One more reason to love my GSIII I wish i could find out who thought of this, so I could buy him/her a beer. Peace!
i never even paid attention... usually the only time im using data while on the phone is at home with wifi or occasionally when im on 4g which of course is not cdma... never new this feature was implemented... good to know gsm no longer has the one up on us...
Does this chipset use a different 3G technology?
I remember when the Thunderbolt came out for Verizon everyone was amazed that it could do this and the reason was Verizon/Thunderbolt's Chipset was using some different type of EVDO revision that allowed it to work or something. Maybe I'm wrong on the technical details lol, but the general idea is right.....
sent from my tired mind
No CDMA device transmits data and cellular at the same time.
063_XOBX said:
No CDMA device transmits data and cellular at the same time.
Click to expand...
Click to collapse
I believe it is LTE devices that will not lose data. CDMA only devices WILL lose data when on a phone call. Am I incorrect?
Do I need to have my intentional misinformation detector sent in for service?
WiredPirate said:
I believe it is LTE devices that will not lose data. CDMA only devices WILL lose data when on a phone call. Am I incorrect?
Do I need to have my intentional misinformation detector sent in for service?
Click to expand...
Click to collapse
The technology in LTE networks doesn't handle voice transmissions it only does data. So when you place a phone call on LTE it’s actually rolling back to the carrier’s older network to use CDMA tech to make the call.
I'm on Verizon and I can do both at the same time. I just tested it.
Well I believe you answered my question about this particular device but just to be clear both my Evo 4G and my evo 4G LTE would maintain data connection while I was talking on the phone not in an LTE area
sent from my tired mind
firecaulk said:
Well I believe you answered my question about this particular device but just to be clear both my Evo 4G and my evo 4G LTE would maintain data connection while I was talking on the phone not in an LTE area
sent from my tired mind
Click to expand...
Click to collapse
No they didn't. You were either on Wifi or they in fact did lose their data. None of the CDMA data+voice protocols are enacted by any US carrier.
firecaulk said:
Well I believe you answered my question about this particular device but just to be clear both my Evo 4G and my evo 4G LTE would maintain data connection while I was talking on the phone not in an LTE area
sent from my tired mind
Click to expand...
Click to collapse
So you are on Sprint? It all depends on the carrier too, I believe. If I remember right, AT&T used to be the only one that could do that that I knew of. I switched to Verizon and realized they didn't have that capability. Then LTE came out and gave that feature to them. I dont know about any other carriers though.
Again let me explain there has been many times I have been using my phone as a hotspot device to watch movies on my ps3 and I would receive a phone call in the middle of the movie I would accept the phone call and keep watching the movie without a problem. There is no LTE in my area of Western Kentucky I am on Sprint with an exceptionally fast 3G connection , I was surprised to find that this device does not have the same capabilities
sent from my tired mind
firecaulk said:
Again let me explain there has been many times I have been using my phone as a hotspot device to watch movies on my ps3 and I would receive a phone call in the middle of the movie I would accept the phone call and keep watching the movie without a problem. There is no LTE in my area of Western Kentucky I am on Sprint with an exceptionally fast 3G connection , I was surprised to find that this device does not have the same capabilities
sent from my tired mind
Click to expand...
Click to collapse
If you used the Evo 4G it may have been connected to data via 4G, which is not the same as LTE. You can do the same with LTE being connected and voice calls. However it can't be done with 3g and voice as they use the same radio and like the above post says no US carriers have that technology. The only reason 4G and LTE works is becase they are data only on seperate radios. Of course it could have been magic.
G-Nexus Sent
firecaulk said:
Again let me explain there has been many times I have been using my phone as a hotspot device to watch movies on my ps3 and I would receive a phone call in the middle of the movie I would accept the phone call and keep watching the movie without a problem. There is no LTE in my area of Western Kentucky I am on Sprint with an exceptionally fast 3G connection , I was surprised to find that this device does not have the same capabilities
sent from my tired mind
Click to expand...
Click to collapse
Well I dont know then. All I know is that my Verizon Galaxy Nexus does both internet and calls at the same time with no issues.
I am posting this during an active call, with no 4g connection
Sent from my EVO using xda app-developers app
I'm just wondering why any download I'm attempting to make will stop whenever I receive a phone call with my Galaxy Nexus?
Sent from my EVO using xda app-developers app
firecaulk said:
I'm just wondering why any download I'm attempting to make will stop whenever I receive a phone call with my Galaxy Nexus?
Click to expand...
Click to collapse
Its not a difficult concept. Your data connection is being cut off because you're on a phone call. You might manage to post (something that can be done on even the slowest weakest connection) but something as intensive as downloading is always going to be interrupted.
063_XOBX is mostly correct.
the CDMA GN has a CDMA radio and a LTE radio. if you are not on LTE and you get a phone call, your data will shut off.
most HTC phones (esp the EVO) have a radio chip which allows data and voice at the same time as there are 2 CDMA radios in the phone.
Zepius said:
063_XOBX is mostly correct.
the CDMA GN has a CDMA radio and a LTE radio. if you are not on LTE and you get a phone call, your data will shut off.
most HTC phones (esp the EVO) have a radio chip which allows data and voice at the same time as there are 2 CDMA radios in the phone.
Click to expand...
Click to collapse
Thank you for your reply, I really love XDA community I knew I could count on somebody for the answer
sent from my tired mind
063_XOBX said:
No they didn't. You were either on Wifi or they in fact did lose their data. None of the CDMA data+voice protocols are enacted by any US carrier.
Click to expand...
Click to collapse
SVDO, while not officially supported, is alive and well. The Thunderbolt, Rezound, Incredible 4G, Viper, and Galaxy S3 on VZW are a handful of phones that are capable of simultaneous voice and 3G data.
Sent from my Nexus 7 using Tapatalk HD
063_XOBX said:
The technology in LTE networks doesn't handle voice transmissions it only does data. So when you place a phone call on LTE it’s actually rolling back to the carrier’s older network to use CDMA tech to make the call.
Click to expand...
Click to collapse
No, VoLTE is not yet available, hopefully soon. That is not what I was saying. LTE handles data during a call, and CDMA handles the voice. If you are not on LTE or WiFi, there will be no data while on the call.
063_XOBX said:
You were either on Wifi or they in fact did lose their data. None of the CDMA data+voice protocols are enacted by any US carrier.
Click to expand...
Click to collapse
You are correct if only taking about CDMA. Cant say for any other carrier, but 100% with VZW you can do simultaneous data/voice if you are in LTE coverage.
Zepius said:
063_XOBX is mostly correct.
the CDMA GN has a CDMA radio and a LTE radio. if you are not on LTE and you get a phone call, your data will shut off.
most HTC phones (esp the EVO) have a radio chip which allows data and voice at the same time as there are 2 CDMA radios in the phone.
Click to expand...
Click to collapse
THIS.
najaboy said:
SVDO,
Click to expand...
Click to collapse
thats the term i was looking for. thanks
Zepius said:
063_XOBX is mostly correct.
the CDMA GN has a CDMA radio and a LTE radio. if you are not on LTE and you get a phone call, your data will shut off.
most HTC phones (esp the EVO) have a radio chip which allows data and voice at the same time as there are 2 CDMA radios in the phone.
Click to expand...
Click to collapse
WiredPirate said:
No, VoLTE is not yet available, hopefully soon. That is not what I was saying. LTE handles data during a call, and CDMA handles the voice. If you are not on LTE or WiFi, there will be no data while on the call.
You are correct if only taking about CDMA. Cant say for any other carrier, but 100% with VZW you can do simultaneous data/voice if you are in LTE coverage.
THIS.
Click to expand...
Click to collapse
To correct something I saw on this thread (and to complement previous commentaries):
- LTE is considered to be a 4G technology
In March 2008, the International Telecommunications Union-Radio communications sector (ITU-R) specified a set of requirements for 4G standards, named the International Mobile Telecommunications Advanced (IMT-Advanced) specification, setting peak speed requirements for 4G service at 100 megabits per second (Mbit/s) for high mobility communication (such as from trains and cars) and 1 gigabit per second (Gbit/s) for low mobility communication (such as pedestrians and stationary users).[1]
Since the first-release versions of Mobile WiMAX and LTE support much less than 1 Gbit/s peak bit rate, they are not fully IMT-Advanced compliant, but are often branded 4G by service providers. On December 6, 2010, ITU-R recognized that these two technologies, as well as other beyond-3G technologies that do not fulfill the IMT-Advanced requirements, could nevertheless be considered "4G", provided they represent forerunners to IMT-Advanced compliant versions and "a substantial level of improvement in performance and capabilities with respect to the initial third generation systems now deployed".
Click to expand...
Click to collapse
- UMTS handles voice with a data call active at the same time.
Sent from my Nexus
So whenever I'm in a call on my T-Mobile Note II, it drops LTE and drops to HSPA, is there any reason for this? I was under the assumption that the Note II can do SVLTE
Sent from my SAMSUNG-SGH-I727 using Tapatalk 2
Normal
Sent from my SGH-T889 using Tapatalk 2
janjannsen99 said:
Normal
Sent from my SGH-T889 using Tapatalk 2
Click to expand...
Click to collapse
The T-Mobile note II doesn't have its own dedicated LTE antenna like basic sy every other phone besides the iPhone 5? Why did Samsung choose to make the Note II like this and why cant I find anything on the internet about it? Seems this should be as easy to find out as the I phone's flaw with LTE. But again, why did Samsung choose to make it this way? Especially when ALL of their other LTE phones support SVLTE?
Oh, and what's your source? I'd like to read up on this not-so-publicised flaw.
You do realize every other LTE device right now drops to either HSPA or CDMA while utilizing voice functions? I have had many, many LTE devices and can verify this.
Sent from my SGH-T889 using xda premium
id10terrordfw said:
You do realize every other LTE device right now drops to either HSPA or CDMA while utilizing voice functions? I have had many, many LTE devices and can verify this.
Sent from my SGH-T889 using xda premium
Click to expand...
Click to collapse
My Verizon Galaxy Nexus, DROID RAZR M, HTC Rezound and, HTC Thunderbolt, all did SVLTE. The iPhone 5 is the only device where the internet made it well known that it is incapable of doing SVLTE because the vast majority of devices devices are capable of it. I mean, if most weren't, then no one would've made a big deal about the iPhone 5 not doing it. Cause that would be hypocritical.
Dr. Hax said:
My Verizon Galaxy Nexus, DROID RAZR M, HTC Rezound and, HTC Thunderbolt, all did SVLTE. The iPhone 5 is the only device where the internet made it well known that it is incapable of doing SVLTE because the vast majority of devices devices are capable of it. I mean, if most weren't, then no one would've made a big deal about the iPhone 5 not doing it. Cause that would be hypocritical.
Click to expand...
Click to collapse
Seeing how Verizon does not have voice over LTE, and as far as I know, no one does since the only way to implement it is extremely costly right now, i highly doubt you had voice over LTE. Your Verizon phones used voice over cdma, and data over LTE, allowing both at the same time. This is why LTE sucks your battery dry on Verizon. It is running two radios at once. Since LTE is an evolution of gsm there is no need for two radios and so you see better battery life at a loss of LTE data while in call.
Sent from my SGH-T889 using Tapatalk 2
_Dennis_ said:
Seeing how Verizon does not have voice over LTE, and as far as I know, no one does since the only way to implement it is extremely costly right now, i highly doubt you had voice over LTE. Your Verizon phones used voice over cdma, and data over LTE, allowing both at the same time. This is why LTE sucks your battery dry on Verizon. It is running two radios at once. Since LTE is an evolution of gsm there is no need for two radios and so you see better battery life at a loss of LTE data while in call.
Sent from my SGH-T889 using Tapatalk 2
Click to expand...
Click to collapse
I said SVLTE, not VOLTE. SVLTE is Simultaneous Voice + LTE while VoLTE is Voice-over LTE.
And on GSM phones that have LTE, they run 2 radios as well. One for LTE or HSPA and one for GSM. As you said, no one is using VoLTE yet. And our GSM/LTE phones need to maintain a connection to GSM even when connected to LTE so that we can still make calls and send/recieve texts.
Theres your proof bud. Just because it isnt what you want to hear doesnt mean its not the reality of the situation.
Sent from my SGH-T889 using Tapatalk 2
Dr. Hax said:
I said SVLTE, not VOLTE. SVLTE is Simultaneous Voice + LTE while VoLTE is Voice-over LTE.
And on GSM phones that have LTE, they run 2 radios as well. One for LTE or HSPA and one for GSM. As you said, no one is using VoLTE yet. And our GSM/LTE phones need to maintain a connection to GSM even when connected to LTE so that we can still make calls and send/recieve texts.
Click to expand...
Click to collapse
Okay to be honest I'm not 100% sure about the number of radios, fairly certain (~75%) only one radio is needed (the 7105 based note 2s have 2 radios, the dormant SoC radio and the GSM/HSPA/LTE radio). I do know you don't drop to GSM for calls, you drop to UMTS otherwise known as WCDMA and can hand off to GSM if needed.
There are plenty of areas with no GSM coverage but have UMTS/HSPA coverage. All these radios are evolutions of GSM and can have VoWHATEVER just no one has done VoLTE or VoHSPA, except T-Mobile has rolled out VoHSPA since the beginning of this year).
This is why your battery will take a hit on HSPA or LTE but not nearly as much as on a CDMA phone.
You are right in that most applications (barring tmobile now) use circuit switched GSM/UMTS for voice, not packet switched UMTS/HSPA/LTE.
Sent from my SGH-T889 using Tapatalk 2
_Dennis_ said:
Okay to be honest I'm not 100% sure about the number of radios, fairly certain (~75%) only one radio is needed (the 7105 based note 2s have 2 radios, the dormant SoC radio and the GSM/HSPA/LTE radio). I do know you don't drop to GSM for calls, you drop to UMTS otherwise known as WCDMA and can hand off to GSM if needed.
There are plenty of areas with no GSM coverage but have UMTS/HSPA coverage. All these radios are evolutions of GSM and can have VoWHATEVER just no one has done VoLTE or VoHSPA, except T-Mobile has rolled out VoHSPA since the beginning of this year).
This is why your battery will take a hit on HSPA or LTE but not nearly as much as on a CDMA phone.
You are right in that most applications (barring tmobile now) use circuit switched GSM/UMTS for voice, not packet switched UMTS/HSPA/LTE.
Sent from my SGH-T889 using Tapatalk 2
Click to expand...
Click to collapse
Oh I can tell my battery takes a hit on LTE! Much more than when I was on Verizon! I just attributed it to the weak signal though.
But you're saying most LTE/GSM phones fall back to HSPA if they were on LTE? I didn't know that. Please excuse my ignorance