No signal on s7 - Samsung Galaxy S7 Questions and Answers

I just purchased a galaxy s7 and have been using it for a few days. The phone was originally for U.S cellular but it was unlocked so I am using it on T-Mobile network. The service icon in my notification bar almost always displays 0 bars however I know that I have a connection because data, talk and text all work. The only time the phone shows me how many bars I have is during a phone call. Is there any way to fix this? Ussd codes also don't seem to be working I get the invalid code or no connection message.

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Connection type display bug on lock screen, other places

My phone network is Orange, and therefore EE, in the UK. (for non-Brits Orange is owned by EE so I should connect to the EE network). As you can see at the bottom of the attached image my Nexus 5 is showing a weird status message for the network I'm connected to. It says
Code:
EE - @@@@@@@@@@@@@@@@
That's 16 @'s!
These are the places I've seen it written like that:
Lock screen
Bottom of the notification drawer (when mobile data is turned on)
On the tile in the quick setting in the notif drawer.
I'm not sure what it's meant to be saying instead of the @'s. Maybe connection type? If I go into Settings>>About Phone>>Status It correctly says EE for Network and HSPA (or whatever else) for Mobile Network Type.
I should note that it is a brand new microsim and I followed my network's instructions for changing sim. I can receive and send calls, texts and data as normal and my old sim has been deactivated. So as far as I can tell this is a purely cosmetic bug, but it's friggen annoying to look at! My previous phone (Nexus S) never had anything weird like this.
Any ideas? Is it the phone or the microsim card? I've tried restarting it with and without the sim in

network connection problem

Once in a while I notice when I have 3 bars showing tmobile LTE on the phone, I can't connect to their network at all. Can't browse anything but it shows I have LTE signals.
I can barely send a text message, but sending a pic through the text won't work. Google play not connecting. Just like dead spot. Does anyone know how to fix this?
It doesn't happen all the time, but certain places I go it will not work. Tonight one example is Disneyland. 3 bars but no connection
I will soon sell my oneplus one and get rid of this problem.

SM-G925F shows full GSM network, but can get calls only on 2G

Samsung galaxy S6 edge (SM-G925F) showing full covarage on 3G or 4G but when you call the number is out of covarage.
on 2G get the calls without any problem.
Tried full flash with ODIN, cleaning connectors inside, change coaxial cables, nothing help.
I have changed many sim cards and different providers. Checked internet, MMS settings, etc. nothing helped.
I also rooted the phone in order to choose bands, but I'm not really sure about that.
Its really strange working perfect on 2G and once I change to Auto the result is this:
Icon 2G (Edge) - always can connect
Icon 4G always can connect
Icon H+ - sometimes connect
Icon H - can not connect
Please help me to solve that issue!
Million thanks in advance!

When my signal bars are low it it doesn't make any call and it show to turn on wifi calling, how do I get ride of that thing?

Hello everyone, I have oneplus 8 IN2019 Verizon with unlocked carrier and using different sim card outside USA. My phone is on Android 11.
I keeps on getting these messages (pictures attached) you are currently out of mobile network range, even though I have few bars or sometimes full bars, I can't even make single calls but receive all the call on low bars

Question Wifi calling icon in notification bar

Do you know how to enable the wifi calling icon in notification bar?
Is there an adb command for that?
I have a US version U1 Ultra and I have 2 providers. a) ATT and b) Freedom (canada).
While the notification icon appears for Freedom in the notification bar and the number 2 is shown (esim), for ATT the phone
does not show any icon. Both wifi calling are active and there is no problem.
I can see the wifi calling only if I go to the dialer and see the wifi calling icon
I have done this experiment with multiple providers and phone (visible, Mint, ATT, Fido, Freedom)
It seems Samsung does not enable the wifi calling for all US companies but it does enable it for all Canadian providers
I don't understand the reason behind that. I do believe having the icon in the notification bar is way
better way to notify the user
I was wondering if there is any adb command to enable the notification for a certain provider
Does it maybe only show for the main sim in use
I'm on tmoble and I don't have a wifi calling icon on my notification bar, only way I know i'm on wifi calling is to pull down the notification panel and see if the network at the bottom says t-mobile wifi calling.
It shows only for me sim2 which is my Canadian provider. I have tried 3 US providers and it never shows any icon. I have to go to the dialer just to see the green call button with the wifi indicator.
It seems Samsung has kept hidden the icon on all US providers for wifi calling
Samsung said all unlocked s22 ultras have the icon disabled for us carriers.
trying to get a answer from tmobile to if ANYONE in the call center has a s22u and has seen this icon is like talking to a brick wall.
the only two options I see for US carriers are to make your call then look at the call screen to see if the wifi calling icon is there ON THE CALL SCREEN or pull the status bar down and look at the bottom of the notification panel.
I have a ticket in with samsung about this being unacceptable and tmobile points the finger at samsung, samsung says since its a branded phone its their fault, so they each want me to go back and forth..
Honestly, my note 9 still works fine and has better battery life. If I could unload this s22 to pay it off at this point I would. The only think I like is dark mode and the camera, the rest of the stuff works better on the note 9 running oreo.
edit - your dial button shows if you're on wifi calling or network calling. it will either be the phone or the wifi calling phone.
I guess thats how they figure people will know. shrug
Samsung unlocked phones do not display the wifi calling or volte icons for US carriers, they never have. The locked versions do.
I don't understand the reason behind that the wifi calling icon is not shown in the notification bar for US providers?
It is really useful to know that you are in wifi mode without pulling down the notification bar or going to the dialer.
Also as mentioned neither the Volte is shown. I know for sure European models show the VoLTE icon on top of the signal
but let's say here in US all or almost all providers are shutting down the 3G networks and VoLTE would be the default so I will not miss it since I know the phone it will be in VoLTE anyways

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