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Question S21 Ultra 5G - SM-G998B - Exynos - Problems with mobile data and signal.

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noone606

Senior Member
Dec 7, 2010
187
8
Samsung Galaxy S21 Ultra
Careful mate the fanboys an all ......
Yeah can swap Sims with the phones in the same location and it's obvious the Huawei is better
I also find the Samsung will struggle but if I toggle airplane mode sometimes it'll come back on lousy, but usable, 4g instead of H+
Huawei even pixel xl will not have issues in the same location's
 

lywyn

Senior Member
Jul 19, 2010
386
140
I have 1 bar on 4G and two speed-test apps get 27Mbps and 30Mbps so although I look to have a bad signal its got a decent data connection for the connection for 4G. After a chat with one of the network engineers, he confirmed the 1-4 bars on phone are not the true reflection of the speed, if you have 1 bar connection you have a good connection. If the speed is slow it is usually the mast and area. One cell tower near my home is right next to a massive Aldi distribution centre and since it opened a few years ago the cell tower is struggling under the excessive amount of phone connections and that is why even stood right next to it the speed is slower than a connection elsewhere with less bars. You cannot assume speed vs low bars is the problem, call your mobile service and raise an issue as I did.
 

noone606

Senior Member
Dec 7, 2010
187
8
Samsung Galaxy S21 Ultra
if you go to settting-about phone-simcard status-you can actually get signal strength in dBm
this is far more relevant than bars
the problem i see over and over again is the dB gets to -120 or so (which is pretty lousy )
so the Samsung drops back to h+ or even no signal but seems very slow to go back to 4g even if the signal improves
if i toggle airplane mode on and off suddenly i will have 4g 1 bar or whatever and usable data
in an area previously the phone showed h+ or even no signal at all
been modding APN's and getting slightly better reliability
had hoped the community had a real fix
 

smoovie2003

New member
Dec 17, 2017
1
0
Hello everyone,


I don't know it this will work for you, but for me it did the trick:


In the APN settings, enter the "Bearer" option and uncheck everything but "LTE".


Save, reboot and check.


It upped my bars from 1 to 3 on 4G Orange România.


Let me know if it did any change with your reception.

Regards.
 

012512

Senior Member
Jun 2, 2013
629
78
Samsung Galaxy S21 Ultra
Hello everyone,


I don't know it this will work for you, but for me it did the trick:


In the APN settings, enter the "Bearer" option and uncheck everything but "LTE".


Save, reboot and check.


It upped my bars from 1 to 3 on 4G Orange România.


Let me know if it did any change with your reception.

Regards.
Man this worked for me!! I will update after a day to see it was ok!
 

Has_anDroid

Senior Member
Jul 1, 2016
1,139
297
Smryne Izmir TURKEY
Oh my god thanks apn lte full signal Android 12 s21 ultra

Screenshot_20211001-025322_Settings.jpg



Screenshot_20211001-025327_One UI Home.jpg
 

Srbija2012

Senior Member
Apr 12, 2012
643
137
Canberra
Samsung Galaxy S21 Ultra
Hi, I have an S21 Ultra 5G, (SM-G998B), the software update is up to date, and for a few days, I started to encounter various problems, sometimes I lose the signal altogether, I can't call, and I can't be called, I receive a message after 10 minutes that I have some missed calls, other times my mobile data does not work, it is set to 5G / 4G / 3G / 2G, I switch to 4G / 3G / 2G and it recovers for a while, then again to 5G / 4G / 3G / 2G when it has problems, to recover.
I thought it was because of the card, but it's not because of it, I changed it, and it still does.
I don't know what else to do, has anyone encountered this problem?
Thank you!
HAHA, i literally just posted this in another thread...

Ive definetly had mobile data issues, slowness, switching between 5G, H+ etc since the last update..

Looks like it may be a bug...
 

Srbija2012

Senior Member
Apr 12, 2012
643
137
Canberra
Samsung Galaxy S21 Ultra
doesn't face any issues with the signal,
If you're going to correct someone's grammar, make sure yours is spot on, otherwise you just look like an idiot.

'doesnt' = DOES NOT face issues with the signal... This isnt proper English!

How about, do not face any issues with signal, or better yet, do not HAVE any issues with signal.

Back in your box champ.
 

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  • 2
    Congrats
    your just lucky
    Most are not
    I'm sorry that you have problems with your device, but do you know most people? The vast majority of people who bought this phone, doesn't face any issues with the signal, so they don't go to post on forums about it. There is always that loud minority who think that everyone has this problem, just because they have it.

    And it's "you're", not "your".
    1
    Has anyone ever found a solution to the abysmal signal strength on this lemon

    Haven't faced any signal issues so far. I get fantastic LTE signal on my S21U, same as my wife's OnePlus 6. No issues with call quality or network speed either.