When I lose WiFi connectivity I cannot then get a mobile data connection, this is fixed by rebooting - until I get a WiFi connection again.
Possibly related - (secure messaging app.) Signal often misses messages for hours - even when I'm on the same WiFi network as the other party.
* Turned off adguard DNS, problems disappeared. Now using AdAway instead *
Related
Can be connected to wifi, but for some reason the phone thinks the wifi connection is bad/poor, and then it will use cellular data (there will be an ! in the wifi)
This is VERY VERY VERY VERY VERY bad for me because I use a LIMITED CELLULAR DATA plan - and this phone decides on its own to not use what is really usable wifi. I have only had the phone 2 days and it is doing it repeatedly - did it at a hotel (which required username/password) but then every single time I leave the hotel and return, it connects to the wifi, but uses cellular data. If I turn off cellular data [I use Power Toggles app to make it easy], the wifi suddenly becomes acceptable to lollipop and the exclamation mark disappears from the wifi icon and I have internet access (no sign in required as the network remembers my mac id/authorized me for at least 24 hours) - and then I can toggle cellular data back on and it will stay on wifi - UNTIL I leave and return again when it starts all over again.
Similarly, at my home where I have strong wifi - sometimes it just decides not to use it. So, when I look at my phone and see the wifi with ! I have to do the same thing - disable cell data to get it to use the wifi.
This is ridiculous!
This switchover to cell data should at minimum be a user-configurable option. I do not want it doing this!
relaxable said:
Can be connected to wifi, but for some reason the phone thinks the wifi connection is bad/poor, and then it will use cellular data (there will be an ! in the wifi)
This is VERY VERY VERY VERY VERY bad for me because I use a LIMITED CELLULAR DATA plan - and this phone decides on its own to not use what is really usable wifi. I have only had the phone 2 days and it is doing it repeatedly - did it at a hotel (which required username/password) but then every single time I leave the hotel and return, it connects to the wifi, but uses cellular data. If I turn off cellular data [I use Power Toggles app to make it easy], the wifi suddenly becomes acceptable to lollipop and the exclamation mark disappears from the wifi icon and I have internet access (no sign in required as the network remembers my mac id/authorized me for at least 24 hours) - and then I can toggle cellular data back on and it will stay on wifi - UNTIL I leave and return again when it starts all over again.
Similarly, at my home where I have strong wifi - sometimes it just decides not to use it. So, when I look at my phone and see the wifi with ! I have to do the same thing - disable cell data to get it to use the wifi.
This is ridiculous!
This switchover to cell data should at minimum be a user-configurable option. I do not want it doing this!
Click to expand...
Click to collapse
go into the main phone settings, wifi, three dots at the top right, advanced, now disable scanning always available
simms22 said:
go into the main phone settings, wifi, three dots at the top right, advanced, now disable scanning always available
Click to expand...
Click to collapse
Already was disabled. (That was the option I chose when I set the phone up).
Hey,so,I tried disabling mobile data and wifi and also background data for certain apps ,but despite that whenever I keep my wifi or data on,the app draws internet ,is it a bug or am I doing something wrong??
Hey..
I have setup a project to system lock phone (deactivate fingerprint login etc.) if it looses connection to mobile networks. This is extra safety for my in the event someone gets hold of it.
To accomplish this I've setup a profile with the state 'Mobile Network', selected all network modes and used the 'any' trigger and inverted to make trigger whenever the state have no mobile networks. This is tested and works but..
.. whenever WIFI is on it doesn't trigger. If you disable WIFI or it looses WIFI connection it triggers.
Is this bad behavior or am I missing something?
The project in whole still works since an active WIFI connection would give me access to my phone and therefore a system lock is only needed in the event I cant reach it, ie. no WIFI and mobile data.
Thank you.
Hi:
My S21 Ultra is the T-mobile variant, in the US.
The Wi-Fi advanced setting for "Switch to mobile data" is nonfunctional, because it has no effect when turned on.
I'm hoping that others can verify this problem: When you are connected to a non-functional Wi-Fi signal (e.g., your phone displays an exclamation point (!) next to the Wi-Fi signal strength indicator), your phone should still be able to access the internet by switching to mobile data, when you have this advanced setting turned on.
However, with my phone, I *CANNOT* access the internet when I connect to a non-functional Wi-Fi signal, whether I turn on or turn off the "Switch to mobile data" advanced Wi-Fi setting.
I'm hoping others can confirm the same issue, so we can escalate as a bug that Samsung can fix. Or maybe somehow it's an issue specific to the T-mobile USA variants of the S21 Ultra?
Anyway, I'm guessing most people don't encounter this bug, because usually you are on a functional Wi-Fi signal. But in my situation, I *NEED* to be able to connect to a non-functional Wi-Fi signal, and access data through the mobile/cellular tower connection. The reason is because that's the only way I can update the firmware on my dashcam. My phone connects to the dashcam via Wi-Fi. That works, and the app can view the dashcam etc. But the app also needs a data connection to download a firmware update for the dashcam. But when I'm connected to the dashcam via Wi-Fi, the dashcam does not provide internet. So I'm stuck because the S21 Ultra *WON'T* access the internet when connected to the dashcam via Wi-Fi, because the "Switch to mobile data" setting does not work and is ignored, so the phone has no data connection whenever I connect to my dashcam.
I figure, if T-mobile doesn't allow this, then they should remove the setting as an option. Why include the setting if it's simply ignored and nonfunctional?
There are some added wifi settings in the developer mode like, wifi scan throttling and wifi safe mode, have you looked into these? I don't have any wifi problems on my S21U unlocked phone, not branded.
In my developer options, Wi-Fi safe mode is off, and Wi-Fi scan throttling is on.
But the issue is my phone refuses to connect to cellular data, even though I tell the phone to please connect to cellular data when the Wi-Fi is unreliable.
I'm not sure that the Wi-Fi specific options in developer mode would cause the phone to refuse to connect to cellular data.
Are you able to connect to an unreliable Wi-Fi, and test whether your phone can automatically receive info via cellular data *WHILE* you are still connected to the unreliable Wi-Fi? You can simulate an unreliable Wi-Fi if you have a modem connected to your Wi-Fi router, and turn off the modem but leave the Wi-Fi router powered on with no internet.
Also, can you check your developer setting for "Mobile data always active"? Is that on or off for you? I don't want to turn on that setting, because I want the phone to save battery and turn off mobile data when I'm connected to a reliable Wi-Fi. The notable setting for me is in advanced Wi-Fi, where the phone can "Switch to mobile data *ONLY* when the Wi-Fi is unreliable and doesn't provide data.
Hi, I have an S21 Ultra 5G, (SM-G998B)and I have problem about 1 month ago. When I am connected to a wifi network, icons 4g is turn on and mobile data stop work. Only way to turn on mobile data is restart phone. What is the problem? I try everething and hard reset but problem not solved. This happens almost every day once or twice
Not sure I understand....the phone will NOT use mobile data when on Wi-Fi. You can force it by going in developer mode and boost speed by using both, that is not the default though. ("Mobile data always active")
"Mobile data always active" is turn off but 4g icons is active in same time as wifi network. After that I turn off wifi and mobile data not work but 4g icons still turn on.
I found out what the problem. Every time after sharing the mobile network via hotspot, when I go to Sim manager and turn off Sim 2, both icons appear and the mobile internet stops working.
1. Turn on sharing mobile data (from sim 1) via hotspot. (sim1 and sim 2 active)
2. Turn off sharing data via hotspot
3. Connect to any wifi (after connect to wifi, only wifi icons appear)
4. Go to sim manager and turn off sim2.
5. After that, both icons (wifi and mobile data) appear and mobile internet stops working.
Does this happen to others?