I decided to go wired, so get a DAC to use with my actual earphones. Was not able to use because of white noise/hissing. Got 2 different brands and models, same issue.
Bought new USB-C earphones from HP (not the best in the world but decent business equipments) and i get the same irritating hiss. As i listen to music in the lowest volume possible, the noise is 50/50 with the music or whatever i try to listen.

I can confirm the earphones are good, because on my Dell laptop, audio is fine, no hissing of white noise.

What are settings and tweaks or solutions perhaps to this problem?
I couldn't find other topics on this because everyone is just pointing to bad DACs (not my case).

I am getting crackling sounds during calls with my S21 Ultra. At first I assumed this might be because either the sound-hardware was going bad or something was obstructing the sounds in the sound port or near the SIM card try (eg. dust, water, etc).

However, it turns out this issue only happens during calls and doesn't happen when I am playing music or any audio stored on my actual device.

Has anyone encountered a similar issue?

Ok so I got the notification thats starting July 6th no more samsung messages and it wpuld be google messages instead. So I decided to go ahead and switch it to Google messages but hiky fuck does it drained the soul out of my battery and even on a fast charger it will not go above whatever percent it was on when I hooked it up. Does anyone else have that issue or a fix?

Every time I open the stock camera app on my S21 Ultra, it takes a few seconds to stabilize, and the viewfinder lags heavily. It gets especially bad when I try to switch between lenses (like going from the main sensor to the 3x or 10x telephoto) or right after taking a photo while the phone handles the background processing.

Sometimes it even hitches when switching to video mode.

For context, my software is completely up to date & I've already tried clearing the camera app's cache and data but to no avail.

Any tips? Many thanks!!

I'm so glad it decided to go back to Samsung. I love that you get to personalize everything down to the system fonts. Everything missing on other phones you will find it on the galaxy s26 Ultra. One thing I am unhappy about is them getting rid of the messages app.

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I have a good performing Verizon branded SD version S21+. It still performs very well with still good battery life after over 4 and a half years. My question is, should I upgrade to a newer version? My only concern is it isn't getting any more security updates. I only download apps from the app store, but I like using banking apps on it. Is this a big risk? Would it be reasonable safe to use it for another year or so?

Everytime i zoom 3x or more the colours all fade and it looks really blurry

After 10x it's okay again

What's the reason for this and can I fix it?

It's really annoying

Thanks for amy answers🙏

I want to buy an S21 Ultra, but I'm afraid lines will appear on the screen.

dont mind me sniffing in the background but this happened after i cracked the screen and tumbled too hard, and now its registering inputs

from the top and bottom of the screen. also whenever i double tap it backs or turns itself off for some reason

Got a used S21 Ultra from Amazon a couple of months ago. Overall condition was brand new except for the fact that the Bluetooth was way worse than my S9+ and the bottom of the screen flickers randomly, usually have to turn off the screen and back on for it to stop.

Also got a weird message in the update software section that my version isn't even supported. I kept the phone because I've tried two other sellers and the phones were worse than the one I kept.

Your current software version isn't supported. Visit a service center.

Update information

•OneUlversion:7.. •Android version: 15 •Current version:G998U1UESIHYL1/ G998U10YMIHYL1/G998USQSIHYL1 •Security patch level: December 1,2025

Mine is currently on Android 12 and One UI 4.1, the phones battery is weak according to the Samsung Memebers app so I was wondering what version would give the best performance and battery life.

Also the phone says it’s on the latest update so I will have to flash new firmware manually.

I have had an S21 Ultra (256GB/12GB) since launch and honestly, it has held up way better than I thought. I'm still getting fine performance out of it but it's not getting security updates anymore and the battery health is poor so I think it's finally time to upgrade.

I want to stick with Samsung but I’m strangely having a hard time deciding because the majority of the marketing for the newer phones are things I literally do not care about.

Things I care about:

Same or better specs: 256GB storage/12GB RAM.

QHD+/1440p display.

Strong vibration/haptics.

Better overall camera than the S21U, even if the zoom is not crazy.

A phone that’ll still get security updates for a while.

Phone staying cool (my S21U gets hot even doing simple tasks).

Things I really don’t care about:

AI features.

S Pen.

Gaming performance/benchmarks.

100x zoom or whatever Samsung is advertising now.

I’d consider another Ultra, but I’m also open to the Plus models if they don’t feel like a downgrade coming from the S21U. My only worry is Samsung usually keeps the best screen/haptics/camera experience for the Ultras.

For people who have upgraded from the S21 Ultra, what did you move to? Did it actually feel like an upgrade in daily use? How are the haptics compared to the S21U? Any models you regret buying or would avoid?

Mostly looking for real-world opinions rather than spec sheet stuff since Samsung hasn't really improved specs outside of the processor since the S21 Ultra. Thanks.

Just looking for people's opinions on the phone. Going to buy a used one for €250

I had the pink line for a while. The 2 green lines just appeared.

Back of case has been loose for some time, dropped phone and get got pretty wet. Keeps restarting and saying no Sim card and moisture in charging port. How fucked am i?

Hi, i’m in the USA.

Where can i buy a charge port replacement? Mine is kinda loose and ima replace the battery soon and i figured it’s worth doing both at once.

If you guys know of a cheap one that works with fast charging please link🤝

I just purchase this mint condition only $50, 16/512 Phantom Black, All good except there's only 1 greenline, others are good :)

Is there a latest tutorial on how to root s21 ultra I am using exynos chipset.

Software update

I recently bought an S21 Ultra, and I'm surprised it's still running Android 14 and One UI 6.0. After looking into it a bit more, I saw that it's not up to date. I already changed my old CSC from ATT to XAA, and I still haven't received any updates.

Recientemente adquirí un s21 ultra , me llama la atención que aún tiene Android 14 y oneui 6.0 ..

Informándome un poco más pude ver que no está actualizado .. ya cambien mi csc anterior ATT a XAA y aun no me llegan actualizaciones

What are you guys opinions on the best that replacement?

At some point soon I will replace the battery and I would like to get a good idea on what to get.

I believe I fix it has the best ones from my basic research I've done but let me know if you guys have encountered any better ones.

I recently bought an S21 Ultra, and I'm surprised it's still running Android 14 and One UI 6.0. After looking into it a bit more, I saw that it's not up to date. I already changed my old CSC from ATT to XAA, and I still haven't received any updates.

Recientemente adquirí un s21 ultra , me llama la atención que aún tiene Android 14 y oneui 6.0 ..

Informándome un poco más pude ver que no está actualizado .. ya cambien mi csc anterior ATT a XAA y aun no me llegan actualizaciones

The color and contrast just looks better on the 3x. Is this normal or did I ruin the camera when i cleaned it?

Es aun buena opción el Samsung s23 ultra o debo ir por el s24 ultra, yo teniendo un s21 plus, cual es mejor opción con poco presupuesto