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Browse while on phone

So is this Verizon's first phone where data service stays active while on the phone? Or is this a feature that comes with hotspot?
Thunderbolt - BAMF Remix 1.5

First VZW phone that does it.
The chip they used for the CDMA radio is the first ever to allow voice and data at the same time over CDMA. Also, if you're in a 4G area, it works by keeping voice on CDMA, and of course using LTE for data.

Really? I would browse to google documents all the time while having someone on speakerphone so I could take notes...
I thought Iphone was the only smart phone that couldn't that.
Sent from my ADR6400L using XDA App

if you had wifi, it would use cdma for voice and wifi for data... i used to hate those att commercials saying we couldnt because i almost always could lol

I have used it for a week, and I can tell you this: You CAN do that talk and browse the web thing at the same time on 4G AND 3G. I did it many times, and no problems. No need to jump on wifi or anything.

Shocked the hell out of one of my co-workers today doing this, since he was a die-hard AT&T fanboy and always tried to throw that up in my face, lol.
He went on to accuse me of secretly using WiFi or that it was a fake Verizon case or something.

Yeah when i read that on their website under the features I was completely sure that it would be Simultaneous voice + data ONLY in a LTE area (Like the HTC EVO and WiMax), but i was incorrect.
You can use Voice + Data while under 3G or 4G, but only if you are in an eHRPD area. (Settings > About > Network > Mobile Network Type) If it shows CDMA EVDO rev a or 1xRTT or whatever, you may not Call and use Data.
EDIT: Also, from what is available on the Net about eHRPD, this is the 'transition' between CDMA/EVDO and LTE.... It would be my guess that this means that anywhere eHRPD is available.... they should expect LTE in 2011. Just my two cents...

necosino said:
He went on to accuse me of secretly using WiFi or that it was a fake Verizon case or something.
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Your co-worker is an idiot.

I use it all the time together its amazing I am always in 4g territory so I literally don't touch WiFi on phone. Gotta love unlimited 4g for same price
Sent from my ADR6400L using XDA Premium App

Topher227 said:
Yeah when i read that on their website under the features I was completely sure that it would be Simultaneous voice + data ONLY in a LTE area (Like the HTC EVO and WiMax), but i was incorrect.
You can use Voice + Data while under 3G or 4G, but only if you are in an eHRPD area. (Settings > About > Network > Mobile Network Type) If it shows CDMA EVDO rev a or 1xRTT or whatever, you may not Call and use Data.
EDIT: Also, from what is available on the Net about eHRPD, this is the 'transition' between CDMA/EVDO and LTE.... It would be my guess that this means that anywhere eHRPD is available.... they should expect LTE in 2011. Just my two cents...
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Click to collapse
Hmmm.. I have been wondering why Verizon isnt using this feature to silence ATT fanboys, but I guess not everywhere with 3G supports it, so they dont want to really advertise the feature if it doesnt work everywhere.

They are most likely trying to perfect their system, as there are probably bugs (not that have seen) they would like to squash out - before going out to squash at&t.
Although i do laugh when i see that at&t commercial now....

Topher227 said:
Yeah when i read that on their website under the features I was completely sure that it would be Simultaneous voice + data ONLY in a LTE area (Like the HTC EVO and WiMax), but i was incorrect.
You can use Voice + Data while under 3G or 4G, but only if you are in an eHRPD area. (Settings > About > Network > Mobile Network Type) If it shows CDMA EVDO rev a or 1xRTT or whatever, you may not Call and use Data.
EDIT: Also, from what is available on the Net about eHRPD, this is the 'transition' between CDMA/EVDO and LTE.... It would be my guess that this means that anywhere eHRPD is available.... they should expect LTE in 2011. Just my two cents...
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Click to collapse
No, eHRPD has more to do with LTE smooth handoffs than simul voice and data.
4g-wirelessevolution.tmcnet.com/topics/4g-wirelessevolution/articles/37366-evolution-options-from-cdma-lte-benefits-ehrpd.htm
Sent from my ADR6400L using XDA App

I'm in 3G only area and voice/data works at same time for me.
Sent from my Thunderbolt using Tapatalk

crazed_z06 said:
Hmmm.. I have been wondering why Verizon isnt using this feature to silence ATT fanboys, but I guess not everywhere with 3G supports it, so they dont want to really advertise the feature if it doesnt work everywhere.
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Probably cuz the iPhone doesn't use it yet?. I have only seen iphones on those att commercials doing the talk and browse thing.

I talked to a Verizon rep and asked them why all their phones didn't do this, they said something along the lines of because they wanted to keep calls on a seperate networks that way it can help stablize and keep from getting dropped calls.. Not sure how accurate that is.. I would think if they are on seperate networks then they could both be utilized..

Tbolt has two radios in it. One for voice/sms and slow data, the other for 3g/4g. That is why you can browse and talk at the same time (as long as you're in 3G or LTE area).

3G Data and Talk at the same time!

Anyone notice that you can Talk+Surf at the same time when on 3G-mode ???
I noticed this the other day when their 4G was down for the entire day!!
This is the only Verizon phone that can do it!!!

Yes sir, that is one of cool features of VZW's LTE network.
Although I rarely use it, it is nice to have

jj3699 said:
Yes sir, that is one of cool features of VZW's LTE network.
Although I rarely use it, it is nice to have
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Agreed since I never really use my phone for talking I find very little need but it really just gives me another reason to love this amazing phone.
Sent from my ADR6400L using XDA App

The reason we are able to do it on 3G as well is because the Thunderbolt has two different antennas. One is for the LTE/3G and one is for the 1X/Text messaging. Because it has the two different ones that's why we will be able to talk and surf. The Bionic may be cancelled because the antennae is not working well with the tegra. And the Samsung Charge will only be able to talk and surf in a 4G area. If you are on 3G you won't be able to talk and surf. So it's a cool feature that hTc has right now. The information is based off of the review of the ThunderBolt below with a couple of bits from what I have been reading.
http://www.anandtech.com/show/4240/htc-thunderbolt-review-first-verizon-4g-lte-smartphone

My friend says he can talk and surf on his Verizon iPhone
Luke

lukesdiesel said:
My friend says he can talk and surf on his Verizon iPhone
Luke
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Then he's lying. Unless he's using WiFi
Sent from my ADR6400L using XDA App

I just realized this yesterday, and it made me SO happy! I've got mad love for my T-Bolt right now!

blackmanx (Twitter's most popular Verizon network engineer) said it was because the Bolt uses SVDO instead of EVDO for it's 3G. This makes it possible to talk and surf at the same time over 3G. So the Bolt is only using the one radio when talking and surfing on 3G
As for 4G, LTE uses a separate radio, but LTE allows for this simultaneous function anyway
And no, the Verizon iPhone very much cannot use this functionality, nor can any other phone currently on Verizon's lineup. You need to go to a GSM network if you want this on any other phone when using 3G

dahotz said:
The reason we are able to do it on 3G as well is because the Thunderbolt has two different antennas. One is for the LTE/3G and one is for the 1X/Text messaging. Because it has the two different ones that's why we will be able to talk and surf. The Bionic may be cancelled because the antennae is not working well with the tegra. And the Samsung Charge will only be able to talk and surf in a 4G area. If you are on 3G you won't be able to talk and surf. So it's a cool feature that hTc has right now. The information is based off of the review of the ThunderBolt below with a couple of bits from what I have been reading.
http://www.anandtech.com/show/4240/htc-thunderbolt-review-first-verizon-4g-lte-smartphone
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So does this mean that our calls don't ever go through 3GEV or LTE, and always 1x?
Reason I ask, is in the 2 weeks that I had the TBolt, the clarity of my calls seem inferior compared to my nexus one on T-Mo 3G, like the person on the other end sounds muffled. Not sure about others, but thats been my experience so far.

ramborami said:
Anyone notice that you can Talk+Surf at the same time when on 3G-mode ???
I noticed this the other day when their 4G was down for the entire day!!
This is the only Verizon phone that can do it!!!
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Click to collapse
Proud of you

actually it IS possible. but only on the eHRPD network. it is 3G and you can talk and surf. The thunderbolt is the only device with it that i know of. you dont need to be in 4G LTE area to get it.

From 4g with full bars to 1x....

I just got my thunderbolt and my 4g keeps dropping.... Is there a problem?
Sent from my ADR6400L using XDA Premium App

Ever since the nationwide outtage a week ago my 4g has been spotty at best.
I have noticed slower 4g speeds on average and it drops alot more as well.

DroidHam said:
I just got my thunderbolt and my 4g keeps dropping.... Is there a problem?
Sent from my ADR6400L using XDA Premium App
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yeah, stop dropping it

I had the same problem after spending a weekend in Mexico - they replaced my SIM card at the store and it has worked fine ever sense.

I keep cycling through 3g/1X and the network is constantly unavailable, wtf is going on? Im so disappointed with this phone so far.
I dont know if I need to install a new radio? I installed bamfs remix 1.6 and some lean kernel, did I do something wrong? My Incredible never had these issues

Where do you live? That obviously matters, 4g coverage keeps expanding in Chicagoland area, I get 4g almost everywhere I go.

I live in Akron, I get full 4g bars then it drops to nothing, then 1x, then 3G. its unreal

Did you enter your address in the coverage map? Don't know how big Akron 4g coverage is, but again, I rarely ever lose 4g around Chicago and the burbs.

Unrooted BOLT, same issue with connection
I have been seeing the same about the connectivity being bad. I live in burbs of Philadelphia, only about 20 mins from city so i'm not going to pin it on my location..
So you are rooted? I however am not. Just got the thing and wanted to see how it was for a bit before rooting, but now i'm thinking before i root i better make sure the phone isn't crap or i'm not gonna be able to return it.
Ugh. Let me know if you're going to try and call VZ, HTC, or whatever. PM me if you find anything.
DroidHam said:
I keep cycling through 3g/1X and the network is constantly unavailable, wtf is going on? Im so disappointed with this phone so far.
I dont know if I need to install a new radio? I installed bamfs remix 1.6 and some lean kernel, did I do something wrong? My Incredible never had these issues
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Click to collapse

it's not just the 4 g service I can even keep a 3g signal have the time and I use to have no problems on my incredible
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DroidHam said:
it's not just the 4 g service I can even keep a 3g signal have the time and I use to have no problems on my incredible
Sent from my ADR6400L using XDA Premium App
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Cant ***
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I'm in Wilmington, DE.
Mine is going up and down, as well as getting 3G or just bars in areas that should be 4G.
Another person in the office here, which should be good 4G, also having his phone do the same.
I'm rooted, he is stock.
It happens to me just about anywhere I go lately.

mg00000 said:
I have been seeing the same about the connectivity being bad. I live in burbs of Philadelphia, only about 20 mins from city so i'm not going to pin it on my location..
So you are rooted? I however am not. Just got the thing and wanted to see how it was for a bit before rooting, but now i'm thinking before i root i better make sure the phone isn't crap or i'm not gonna be able to return it.
Ugh. Let me know if you're going to try and call VZ, HTC, or whatever. PM me if you find anything.
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Click to collapse
I don't know where you got that information from but thats false. You can easily return to a complete stock state after rooting if need be.
http://forum.xda-developers.com/showthread.php?t=1009423

mg00000 said:
I have been seeing the same about the connectivity being bad. I live in burbs of Philadelphia, only about 20 mins from city so i'm not going to pin it on my location..
So you are rooted? I however am not. Just got the thing and wanted to see how it was for a bit before rooting, but now i'm thinking before i root i better make sure the phone isn't crap or i'm not gonna be able to return it.
Ugh. Let me know if you're going to try and call VZ, HTC, or whatever. PM me if you find anything.
Click to expand...
Click to collapse
Pretty much from Mid-County to the Lehigh Valley exit is still 3G in most areas but south towards the city and in the Lehigh Valley itself is all LTE. I travel down from Allentown to Philly regularly and I can tell you this from personal experience.
FYI Lehigh Valley LTE is down right now but I just got out of a meeting with Verizon (less than an hour ago) and they supposedly knew there was some maintenance being done in our area (so that may be the reason for the current outage.) If you switch out of LTE Mode to CDMA LTE auto you should pick up 3G (I'd also enable airplane mode and then disable it to pick up a strong 3G for right now.)
Oh and +1 on the rooted/non-rooted thing. You can flash back to non-rooted stock from a rooted state to send it back. Instructions are in the development forum.

Cubs2008 said:
Pretty much from Mid-County to the Lehigh Valley exit is still 3G in most areas but south towards the city and in the Lehigh Valley itself is all LTE. I travel down from Allentown to Philly regularly and I can tell you this from personal experience.
FYI Lehigh Valley LTE is down right now but I just got out of a meeting with Verizon (less than an hour ago) and they supposedly knew there was some maintenance being done in our area (so that may be the reason for the current outage.) If you switch out of LTE Mode to CDMA LTE auto you should pick up 3G (I'd also enable airplane mode and then disable it to pick up a strong 3G for right now.)
Oh and +1 on the rooted/non-rooted thing. You can flash back to non-rooted stock from a rooted state to send it back. Instructions are in the development forum.
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Click to collapse
Hi there, thanks for that info i appreciate it. I seem to be missing where htc allows us to switch btwn the 4g and 3g, i searched for the question but didn't get much results. So i'll my noob question right here. Where is that done?
I see under Settings > Wire & networks > Mobile network settings there is a System select option, for "Change the cdma roaming mode", is this where i'm supposed to be? Roaming doesn't seem to be the area i'd think to have to change this particular thing, but i don't see much else in these menus. Please advise or link a thread that i didn't see in my results.

Verizon has a problem with their new eHRPD network.. which is what the Thunderbolt is on by default.. (this allows for 4G + simultaneous talk and browse on 3G).. However, though 4G works OK, 3G doesn't seem to.
In order to tap into Verizon's original 3G network.. dial ##778# on your phone.. go to edit mode (you'll see pop up after you dial that number)..password is 000000 (6 zeros).. go to modem settings.. Rev.A and eHRPD is probably selected there by default.. choose "Enable" option... which will kick it out of eHRPD and then hit menu.. commit changes.. and the phone will reboot. You'll be on Verizon's original 3G network which will work fine.. but you won't have 4G.

I don't know about you but I still have 4g...

4g
g00s3y said:
I don't know about you but I still have 4g...
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I knew N.J. was better
Go Giants!!

kriskmk said:
Verizon has a problem with their new eHRPD network.. which is what the Thunderbolt is on by default.. (this allows for 4G + simultaneous talk and browse on 3G).. However, though 4G works OK, 3G doesn't seem to.
In order to tap into Verizon's original 3G network.. dial ##778# on your phone.. go to edit mode (you'll see pop up after you dial that number)..password is 000000 (6 zeros).. go to modem settings.. Rev.A and eHRPD is probably selected there by default.. choose "Enable" option... which will kick it out of eHRPD and then hit menu.. commit changes.. and the phone will reboot. You'll be on Verizon's original 3G network which will work fine.. but you won't have 4G.
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that defeats the purpose eh? Is this the same thing built into BAMF?

DroidHam said:
that defeats the purpose eh? Is this the same thing built into BAMF?
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Click to collapse
I am not sure.. i don't use BAMF..

AT&T LTE Network Going Live This Sunday

http://www.maximumpc.com/article/news/att_lte_network_going_live_sunday
The cities included in this initial wave are Atlanta, Chicago, Dallas, Houston and San Antonio. Although users in those metro areas will still have very few LTE devices to choose from. Unlike Verizon, which has multiple LTE handsets, AT&T has no phones compatible with the new network. AT&T launched a data stick and a portable hotspot for the LTE network last month. The carrier has also started selling a massively overpriced Android tablet, the HTC Jetstream.

sweet im in San Antonio for a little while, now for AT&T to get some phones for me to use !!!

Now if they could hurry up and increase the HSPA+ speeds. I'm still only getting 3.5mb download and 1mb upload in downtown Dallas.... iPhone 3gs gets about the same download speed, although only half of the upload speed.

Come to the other side of the Metroplex. Downtown Fort Worth and I am getting 5-7mb down, 1.1-1.3 up. I can't wait for the Holiday with LTE. That will be SO sweet.

id10terrordfw said:
Come to the other side of the Metroplex. Downtown Fort Worth and I am getting 5-7mb down, 1.1-1.3 up. I can't wait for the Holiday with LTE. That will be SO sweet.
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X's dos my brotha from anotha motha.
Saved and Texan by the grace of God, Redneck by choice.

I know the Inspire is not a LTE phone, but just launching the network upgrade has helped me to see vastly improved data speeds. I also know the Speed test app is not accurate, but I have never seen it pull these kind of speeds, especially consistently.

Well, I would like if it came out in Madison soon... (and when AT&T has more LTE Android phones)

Ok I live an hour away from Houston. Do you think I would still be getting LTE? Also do we need a new sim card or anything or does it automaticly happends?
Sent from my HTC Inspire 4G using xda premium

codyperez86 said:
Ok I live an hour away from Houston. Do you think I would still be getting LTE? Also do we need a new sim card or anything or does it automaticly happends?
Sent from my HTC Inspire 4G using xda premium
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first of all you would need an LTE capable phone....the inspire is not

codyperez86 said:
Ok I live an hour away from Houston. Do you think I would still be getting LTE? Also do we need a new sim card or anything or does it automaticly happends?
Sent from my HTC Inspire 4G using xda premium
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As mentioned, you would need a LTE phone first. But, being an hour away from Houston, I wouldn't run out and buy one when they become available. I live in the outskirt of Houston and HSPA+ is non existent at home. In Houston where I work, as posted, I am just now seeing the true benefit of HSPA+. Probably some bottlenecks from ongoing upgrades being freed up, maybe a little congestion as well.
Sent from my Inspire 4G using Tapatalk

Knowing how AT&T operates, I'd imagine they opened up more bandwidth to the land-based lines to the area first to make sure their LTE debut went well and you're just seeing some of that extra bandwidth.

fernandezhjr said:
I know the Inspire is not a LTE phone, but just launching the network upgrade has helped me to see vastly improved data speeds. I also know the Speed test app is not accurate, but I have never seen it pull these kind of speeds, especially consistently.
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Click to collapse
Turn off your wifi, Comcast customer.
"at&t 4G? lol. It's more like 0.4G"

knarfl1 said:
Turn off your wifi, Comcast customer.
"at&t 4G? lol. It's more like 0.4G"
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Click to collapse
I'm not as stupid as you. I know when I'm on wifi. Here is the proof.

Here are some from earlier today. The first two were indoors, a large metal building with offices above on the second floor. The first run was bad, only 2800kbps, but I did hit 4916kbps on the second. I then went outdoors and tested a lil slower than yesterday, but not by much, 6485-7767kbps. I know we can't put too much stock in the Speed Test app, but there is some consistency and I'm getting much higher runs than I had been. Also, it seems to be reading my wifi at home with some accuracy.

fernandezhjr said:
I'm not as stupid as you. I know when I'm on wifi. Here is the proof.
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lol.
Then why do you make statements like LTE network is improving the throughout of a HSPA+ phone on the 3G stack?
"at&t 4G? lol. It's more like 0.4G"

knarfl1 said:
lol.
Then why do you make statements like LTE network is improving the throughout of a HSPA+ phone on the 3G stack?
"at&t 4G? lol. It's more like 0.4G"
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Click to collapse
Show me where I made that statement. I stated that since the LTE launch, my data speeds have suddenly increased and I'm finally seeing true hspa+, and that is a fact. I provided a couple of possible reasons for this, as someone else cited a possibility as well. I know what you saw. You saw the hosted by Comcast in the screenshot. Lol. Anybody with half a brain would know that there would have been a wifi icon in the status bar if I was on wifi. Next time you open your mouth, try not to put your foot in it. Your little signature says it all. Just because you are in a crummy area, doesn't mean it is like that everywheres.
Check my screenshot of prior tests and tell me if you see any improvement compared to yesterday and today. LOL.
Sent from my Inspire 4G using Tapatalk

Peace my friends peace
Sent from my Inspire 4G using XDA Premium App

trell959 said:
Peace my friends peace
Sent from my Inspire 4G using XDA Premium App
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I'm good. I just don't appreciate someone implying I'm either stupid or I'm a liar. It certainly isn't inconceivable that while AT&T was building the LTE network here in Houston, they were improving the backhaul for hspa+. Whatever the source of the improvement, I'm thrilled to see true hspa+ speeds. It is something I never expected to see with my Inspire.
Sent from my Inspire 4G using Tapatalk

The cities included in this initial wave are Atlanta, Chicago, Dallas, Houston and San Antonio. Although users in those metro areas will still have very few LTE devices to choose from. Unlike Verizon, which has multiple LTE handsets, AT&T has no phones compatible with the new network. AT&T launched a data stick and a portable hotspot for the LTE network last month. The carrier has also started selling a massively overpriced Android tablet, the HTC Jetstream.[/QUOTE]
No westcoast cities in the works??

They finally turned on hspa+ in okc ok I'm seeing 7-9 dl constanly ul still around 1 but better signal to at my use to get 10- 30 percent now 70 -95 crazy how just one day they just flipped it on finaly I use to leave my phone on edge as o could surf internet faster that way not anymore
Sent from my Inspire 4G using xda premium

does the voice use LTE or just data?

Never bothered to look this up and can't find any info on AT&T ...
Sent from my MB865 using Tapatalk 2

Lte is just for data. 2g/3g is data and voice.
Sent from my SGH-I777 using XDA

At some point when ATT has migrated all of their coverage to LTE capability the network will switch to LTE for voice. Neither ATT or Verizon use LTE for voice calls yet.
Likely within a decade they will turn off their traditional TDMA based GSM voice network altogether and everything will be on their LTE spectrum.
sassafras

I'm wondering if they'll throttle LTE during phone calls as well. Hmmmmm

pretty sure they only use gsm for calls, as people without data plans that have smartphones (dont know why they do that ) still make calls and text, just cant access teh interwebz

MattMJB0188 said:
I'm wondering if they'll throttle LTE during phone calls as well. Hmmmmm
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Click to collapse
You will get 2g/3g during calls.
Sent from my SAMSUNG-SGH-I717 using xda premium

nunyabiziz said:
You will get 2g/3g during calls.
Sent from my SAMSUNG-SGH-I717 using xda premium
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No you didn't get it. Even without LTE they slow down any connection when on a phone call to save bandwidth. You can be getting 6 mbps down and then make a phone call and barely hit one and the upload is like 0.00mbps.
Test it out. Immsuremit will be like that once LTE is voice enabled.

bimmerd00d said:
Never bothered to look this up and can't find any info on AT&T ...
Sent from my MB865 using Tapatalk 2
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The current deployments of LTE are based on the LTE Release 8 with LTE used for data and 3GPP/3GPP2 (i.e. GSM/UMTS/CDMA/EVDO) for voice.
This will all change when the carriers move to the VoLTE (Voice over LTE), which is most likely a few years away.

enigma00 said:
This will all change when the carriers move to the VoLTE (Voice over LTE), which is most likely a few years away.
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Yes, from what I understand, there is no standard yet for Voice over LTE, the various stakeholders are still working this out, and its still a long ways away.
So for the present time (and near future), LTE is data only (and no voice) on all carriers.

MattMJB0188 said:
No you didn't get it. Even without LTE they slow down any connection when on a phone call to save bandwidth. You can be getting 6 mbps down and then make a phone call and barely hit one and the upload is like 0.00mbps.
Test it out. Immsuremit will be like that once LTE is voice enabled.
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So are you agreeing or disagreeing with my statement? Sounds like you are disagreeing, if so how is what you just posted different from mine?
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nunyabiziz said:
So are you agreeing or disagreeing with my statement? Sounds like you are disagreeing, if so how is what you just posted different from mine?
Sent from my SAMSUNG-SGH-I717 using xda premium
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I wasn't agreeing or disagreeing. I was stating something entirely different from the OP.
Its not widely known that AT&T throttles all data speeds during calls and I was being sarcastic by adding that once you can do LTE over voice, they'll throttle that too during calls only.
Run a speedtest next time your on the phone and you'll see. Doesn't matter what data plan you have, they throttle all data speeds during calls.

MattMJB0188 said:
I wasn't agreeing or disagreeing. I was stating something entirely different from the OP.
Its not widely known that AT&T throttles all data speeds during calls and I was being sarcastic by adding that once you can do LTE over voice, they'll throttle that too during calls only.
Run a speedtest next time your on the phone and you'll see. Doesn't matter what data plan you have, they throttle all data speeds during calls.
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Agreed, I told At&t that i wanted to cancel my service because Im paying for hotspot and its shif during calls. I was never told this before signing up for service. Im upset because hspa+ is enough for my needs and will work during calls but they had to go and throttle the service!
Sent from my SAMSUNG-SGH-I717 using xda premium

redpoint73 said:
Yes, from what I understand, there is no standard yet for Voice over LTE, the various stakeholders are still working this out, and its still a long ways away.
So for the present time (and near future), LTE is data only (and no voice) on all carriers.
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The standard is pretty clear.
You have 3 options for voice under LTE (as of Rel8):
VoLTE - IMS VoIP using AMR
CS (circuit switched) Fallback - basically have the phone camp in the LTE network, and fallback to 3GPP/3GPP2 only in the case of voice calls
SVLTE (Simultaneous Voice and LTE) - the scenario I already described and launched with most NA carriers
The reason for the delay in VoLTE deployment is the difficulty (and cost) in implementation. VZW, AT&T, etc. would probably want to recoup investments in the 3G network already in place before they spend more for VoLTE. At some point in the future, recovering air spectrum from the 3G band is going to be a higher priority than re-using the deployed 3G network, and that's when we'll see more VoLTE movement.