Hello,
I have a S7 SM-G930F with G930FXXU2DRA9 official ROM, without root and I noticed a problem on the aggregation of frequency bands.
My mobile operator uses 800Mhz (B20-FDD) and 1800Mhz (B3-FDD) tapes to make 4G + at 150Mbps.
The S7 is unable to aggregate these two frequencies, I also tested my sim in an S7 edge and same problem.
In the menu engineer with the code * # 0011 # I see that the S7 hooks well the two frequencies but without the aggregates.
Which means that I only have normal 4G on 1 frequency.
I put a sim of another operator in my S7 which has a 4G+ network with 800Mhz + 2600Mhz, and I have 4G +.
To see if it's not my sim that's the problem, I put it in a Oneplus 5t and there I have 4G + with 800Mhz + 1800Mhz.
The problem come from the S7 who do not want to aggregate.
Have any of you noticed that?
If I install a custom rom or flash modem, will that fix the problem?
Flashing your carriers Home_CSC and CP files are probably your safest bet. But if you bought it from your carrier then it should already have these, if you didn't it's probably using the stock CSC which may not be configured for your carriers network.
updato.com or sammobile.com should have firmware for your carrier, if you don't want to lose data make sure to flash home_csc. Normal CSC will wipe.
Hello,
I had thought but my operator does not sell branded phones, so no modified csc.
There is just one application that the operator makes available to automatically set up the APNs, that's all.
So I flash the modem + the csc from 3 other operator in my area using the same standard 4G FDD, the problem remains the same.
The only change is that I had a better network hang on some modem.
This is strange it is as if on the combination 800Mhz + 1800Mhz the Carrier aggregation is disabled, and that as soon as there is a higher frequency, 800Mhz + 2600Mhz, the Carrier aggregation is activated.
Unfortunately the Hidden Engineer Menu, allowing to make deeper changes to the connection mode has been disabled with Ota samsung
Related
I am very interested in using the Exynos S7 on Metro PCS/ Tmobile due to about 20% better battery life.
What I will get is 1 hour or more of SOT compared to Snapdragon.
What I will lose ( probably ) is*
VoLTE - this means you have fast [LTE ] Internet while on a call- great for business customers.
Those using Exynos Phones in USA..
1) Do you have simultaneous Voice and Data ?
2) What Band is your Phone on while on the Internet during a Call? H+ is quite fast IF the phone stays there.
IF the phone drops to 3G during calls the Internet will be slow.
A) Why do I need Voice and Internet simultaneously ?
Business Calls -when you need to reference something Online during a call.
B) It was amazing to me a few years back how few people knew what VoLTE is - (voice and data on LTE= simple) Metro PCS was one of the very first to have it back in 2012 which is one of the reasons Tmobile bought Metro.
C) VoLTE USUALLY requires specific Carrier Software (and a VoLTE capable Device)- so not transferable from one Carrier to another - Android was going to include it as Standard Option in Android BUT this never happened.
So Exynos Users S7 or S7 Edge in USA how is simultaneous Voice and Data working for you?
About VOLTE, while it is not enabled by default on unbranded handsets (phones using CSC such as: XEF, BTU, DBT,XOA...), you can flash a carrier ROM CSC (one from a carrier that handles VOLTE, like BOG) and the feature will be enabled after a factory reset of the phone, the feature once unlocked can be used on any carrier and does not require any specific carrier software to work
1) Yes it does, that's part of the WCDMA standard, however if you are connected to a LTE network that does not handle VOLTE or if the VOLTE feature is not enabled on the phone, it will use CS callback and drop from LTE to HSPA for the duration of the call
2) During CS fallback, the phone uses "H+" (which is really Dual Carrier HSPA)
Where can you get flashable csc? Am I chasing Unicorn here?
Btw OP i am currently using 64GB version of Samsung Galaxy S7 from Korea - g930s.
It stays at H+ during the call.
Hi everyone,
I have an S8+ I bought abroad, when I use my Rogers sim I get 4G not LTE. However when I use the sim on my Priv, I get LTE. I am using the Rogers APN.
Is there anything I can try?
Thanks
What country code/model is the phone? It's just an icon - whether you see 4G or LTE icon all depends on the CSC the device came preset with.
The only potential issue is with the European models (G95XF / G95XFD) lacking band 30, which some carriers (like AT&T) use for Enhanced LTE. While Enhanced LTE does work, it doesn't support the full speed that comes with band 30.
Do a speed test. If your S8 and Priv report the same speed, don't think about it too much.
The phone I bought from Saudi Arabia. Model is SM-G955F.
I do get similar speeds.
Can I change the preset without rooting the phone?
Thanks again
Usually f models shows 4g icon rather than the LTE icon.....so you are perfectly fine
Signal icons are usually csc dependant... you can see what csc is on the phone and search online to see which csc has the icons
YandereSan said:
What country code/model is the phone? It's just an icon - whether you see 4G or LTE icon all depends on the CSC the device came preset with.
The only potential issue is with the European models (G95XF / G95XFD) lacking band 30, which some carriers (like AT&T) use for Enhanced LTE. While Enhanced LTE does work, it doesn't support the full speed that comes with band 30.
Do a speed test. If your S8 and Priv report the same speed, don't think about it too much.
Click to expand...
Click to collapse
Mine works perfect on rogers.
Its a device from panama and it displays LTE. A few of my previous F versions did show 4g....but same deal
sent from my Note FE, S8 plus, S7 edge or S6
force70 said:
Mine works perfect on rogers.
Its a device from panama and it displays LTE. A few of my previous F versions did show 4g....but same deal
sent from my Note FE, S8 plus, S7 edge or S6
Click to expand...
Click to collapse
Mm, yeah.. I know it's some cscfeature, just can't figure out which one. When using BTU, it shows up as 4G, but switching over to a XAA csc changes it to LTE. Speeds are the same.
ssadtru said:
Hi everyone,
I have an S8+ I bought abroad, when I use my Rogers sim I get 4G not LTE. However when I use the sim on my Priv, I get LTE. I am using the Rogers APN.
Is there anything I can try?
Thanks
Click to expand...
Click to collapse
Middle Eastern phones like the one you bought don't show 'LTE', they show 4G in the status bar, but to confirm you can open the dialer and dial *#0011# and see LTE-BASIC Info, like what LTE Band your phone is using and other detailed information about the cellular connection.
Hello My Friends
Sorry English Not First My Language
i Want Buy This phone G930F Verizon Carrier
Can i use this phone With 2G Network By Change rom or any way ?
See Attached Photo To This Post to know what i,m talking about .
Regarding the observations of the professors can i use this phone on 2G netowrk ?
Verizon doesn't do G930F models, Verizon's are G930V's. They come with different network modems intended for US carrier networks which differ to international, also a different CPU chipset and locked bootloader.
So I'm pretty sure it's a fake and why it says LTE / CMDA / UMTS and not LTE / 3G / 2G, because it's a G930V faked to look like a G930F. For reference my G930F says LTE / 3G / 2G under that menu.
A G930V can't be flashed with a ROM because it has a locked bootloader.
If you can boot into download mode without the seller noticing (Vol down + home + power) the real phone model will be in there.
Phone A (mine): G930FD, Superman Android 7
CSC: UK-BTU multi-csc
SIM: StraightTalk T-Mobile towers
APN: StraightTalk
Phone B (friends): G930V, Stock Android 7
CSC: Verizon multi-csc
APN: MetroPCS
My friend got phone B for her MetroPCS sim (which uses T-Mobile towers I think), it didn't work at all. I tested phone B with my StraightTalk T-Mobile sim, it worked, speed test: 42mbps.
Then I decided to try the speed test with my phone A in the same location (a few hours later) and my StraightTalk T-Mobile sim, 12mbps
There are so many varying factors. Which are the ones that matter? My G930F supports more bands and has my proper APN settings, I would think it would be equivalent if not better... I'm guessing it's primarily the BTU CSC? I'd tried T-Mobile CSC but that caused issues. And that other phone is a Verizon CSC anyway. Should I flash to Verizons CSC? Also I'm using Superman ROM.
Also, why wouldn't her MetroPCS sim work in phone B? It worked with mine and they both use T-Mobile towers...
The most important factor here is the phones are completely different SoC with different modems.
The G930FD is Exynos and the international model, the modem is built to the international standard of carrier networks.
The G930V is Snapdragon and the modem specifically designed to make use of the USA network standards which differ to the rest of the world.
So even with the required band support, it's different technology. Outside of the USA, I would expect the G930V to perform worse than the G930FD, and vice versa for inside the USA.
As for why the SIM doesn't work, the G930V is the verizon variant, which is default carrier locked. Since your SIM works it may have been carrier unlocked, but it might not be.
I have an SM-G935V phone. I have flashed the "G935U" Nougat on it to get rid of the VZW bloatware. Eventually I even got the Oreo OTA update. U version. The LTE bands remained unchanged after flash and upgrade to the "V" ones.
Now, I am using it on a VZW MVNO, so LTE bands where OK for me. Because I am curious, I have added all the LTE bands that the U version would have using the Qualcomm software, as described here:
https://forum.xda-developers.com/galaxy-s5/general/how-to-add-rf-lte-frequency-bands-to-t2886059
The NV cell #06828 for my original V radio had the value 4190. That means LTE bands 2,3,4,5,7,13.
I have changed that cell value to 2062440470751. That means LTE bands 1,2,3,4,5,7,8,12,13,20,25,26,29,30,38,39,40,41 (like they are on the U hardware, plus band 13 that is not found on the U).
Didn't add B17 because presently it's just a subset of B12.
Well... when I have traveled in EU, band 20 didn't seem to work. But I admit I didn't do extensive testing.
Now, in US, I had the occasion to test an AT&T SIM. To my surprise, I found out that bands 12 and 30 seemed to have appeared, and I even had CA with band 2 (LTE+). So it seems that that worked... see the pics from service mode.
Band 2 with CA on 12, band 12 with CA on 2 and band 2 with CA on band 30.
I just received, on my SM-G935V hardware, the latest Oreo "U" update (G935UUES4CRG3). I have install it and... of course the LTE bands reverted to the "V" ones, like always.
I have changed them back to the more inclusive set like I did before, however I took a screenshoot of the original LTE band NV value - for whoever is interested. The number is 4190 and that translates into LTE bands 2,3,4,5,7,13. Most of the sites quote more bands for the G935V, but I guess nobody really took the time to actually verify that.
And no, as you can see, just flashing the "U" firmware over "V" won't add any of the missing bands. Those band settings are stored somewhere else, in the modem non-volatile memory.
Did more experimenting. Changing the SIM with another one triggers the re-flashing of the CSC with the new one. Well... surprise the AT&T SIM added the needed bands with CSC ATT.
Picture attached.
Putting back the Tracfone SIM, CSC code was re-flashed (TFN) and... NV was re-written with the 4190 one (LTE bands 2,3,4,5,7,13).
See attached the pic of the Service menu *#2263# from AT&T CSC listing the bands. I can't take screenshoots from the TFN one, because that SIM blocks the Service RIL menu.
So, modding the bands can be useless, because it gets re-written by the CSC settings at every SIM change.
I found out how to enable the Service Menu *#0011# on my Verizon SIM, in case that anyone is interested.
The dialer code for enabling is *#22745927 , followed by MSL "000000". If your phone is carrier locked, the MSL will be different.
I just came back from a visit to Spain, Vodafone SIM, and I saw LTE bands 3, 7 and 20 working on my S7Edge Verizon with the "U" firmware - I have used cellmapper to map the towers.
No modding was needed, maybe because those are also present in the underlying V hardware.
Very nice write-up. I'll have to try that!
I read that I can install the firmeware of sm-935U in my sm-935V, but when i enter in sammobile page ,there is a huge list of 935U firmeware, wich of those do i have to select to work fine in my phone