Develop Bugs

Wifi calling - preferences - disable cellular radio

Searched for other threads but didn't find anything that specifically addressed this. It's probably old news to many but I hope this helps out other noobs.
In Galaxy S2, enable wifi-calling and you can change the connection preferences to
1. Wifi preferred
2. Cellular preferred
3. Wifi-only.
Options 1 and 2 are self-explanatory, but I didn't quite understand why anyone would want to select 3 over 1, until I tried it out.
When I selected wifi-only, the cellular voice signal bars are dark. I think this setting essentially disable cellular voice radio.
This is important if you travel abroad and want to use the wifi calling feature because wifi-calling cannot be enabled with airplane mode on. Also I don't think wifi-calling works with a non t-mobile sim card.

I'm on Wifi-Preferred and my radio is always disabled automatically

From the company that makes the wifi-calling tech for T-mobile
http://www.wificalling.net/help/
It is possible to configure the Wi-Fi Calling Application to enable calls over Wi-Fi only, essentially keeping the phone off the cellular network. If you set the Connection Preference to Wi-Fi ONLY, the application will work over Wi-Fi and, when you go out of range of a Wi-Fi signal, will NOT accept or make calls on the cellular network. This is similar to putting the phone into AIRPLANE mode with Wi-Fi Calling.
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[Q] How to disable all incoming calls?

Is it possible to temporarily disable all incoming calls without disabling wifi and 3g connection? I would like to use my phone as youtube player without unexpected interruptions of incoming calls... thank you...

amonar said:
Is it possible to temporarily disable all incoming calls without disabling wifi and 3g connection? I would like to use my phone as youtube player without unexpected interruptions of incoming calls... thank you...
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It is possible. Put the phone in airplane mode then turn on Wi-Fi. All radios will be off except for Wi-Fi and you can't receive phone calls with it.

Thank you... this helped... is there a way to use a 3g with incoming calls disabled?
DR3W5K1 said:
It is possible. Put the phone in airplane mode then turn on Wi-Fi. All radios will be off except for Wi-Fi and you can't receive phone calls with it.
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amonar said:
Thank you... this helped... is there a way to use a 3g with incoming calls disabled?
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Not sure about a gsm phone but on my CDMA Verizon phone. Dial *#*#4636#*#* in the dialer. Then select lte only from networks and you can use lte with no phone calls. On Verizon it's not possible to do data only on 3g because 3g supports calls texts and data. LTE or 4g is data only.

I'm not sure if this is ROM specific (I'm using Cyanogenmod 10.1.3), but there's a Blacklist option if you go to settings in the dialer:
Dialer (Phone) > Settings > Blacklist
Once you do it'll bring up the menu in the attached screenshot. If you set yours up like in the screenshot (enabling wildcards and adding * to the blocklist), it will block all incoming calls. It will not affect any other communications besides incoming calls, so you can use 3G. If you leave the option checked, it will also let you know in the notifications that you received a call. I tested and confirmed all this.
Hope this helps.

WiFi calling turning on and off by itself

I have a metroPCS unlocked Snapdragon S9, and I have my WiFi calling set to cellular preferred, but my WiFi calling keeps turning itself on and off all the time. I like WiFi calling and find it useful, but I have had problems with latency and poor call quality, so I don't want to use WiFi calling unless the cellular network isn't available. But my phone just keeps turning WiFi calling on and off by itself when I have the preference set to use the cellular network by default. I get excellent reception at home and most places I go to, so I don't understand why WiFi calling is on when I have it set to use the cell network by default.
Has anyone else had this problem? Does anyone know a solution short of disabling WiFi calling entirely?

No internet when I'm on voice call

Hi folk, so I've something strange: when I'm on voice call (make or receive) my network change from 4G to H/H+ and internet doesn't work. When call finishes, network go back to 4G and I'm able again to surf internet.
I called my mobile company, Vodafone IT and they told me it's a phone problem (they don't use VoIP) so I contacted Google assistance but since my phone is magisked they can't help me.
Any idea?

last_nooby said:
Hi folk, so I've something strange: when I'm on voice call (make or receive) my network change from 4G to H/H+ and internet doesn't work. When call finishes, network go back to 4G and I'm able again to surf internet.
I called my mobile company, Vodafone IT and they told me it's a phone problem (they don't use VoIP) so I contacted Google assistance but since my phone is magisked they can't help me.
Any idea?
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This is a normal behavior and has nothing to do with your phone or Magisk: If your carrier does not support VoIP, the phone has to switch to 3G or even 2G to make the phone call. After the call has ended, it switches back to LTE.
I know that this can be a PITA, especially when you are supposed to take part in a Skype or Webex meeting with screen sharing and you are sitting in a hotel with bad WIFI. Then you use the phone as WIFI hotspot. As soon as you call in, your web meeting is unreliable.
Been there, done that. There is no way around this, the only thing which works for me is to take part in the call via my notebook instead of calling in via the phone. Then LTE stays - as long as nobody calls you

@BabelHuber thank you for your answer.
But why this happens?
Why isn't possible to have call and 4G/LTE at same time?

last_nooby said:
@BabelHuber thank you for your answer.
But why this happens?
Why isn't possible to have call and 4G/LTE at same time?
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Because the LTE standard simply does not support voice calls.
Hence if you don't have VoIP, the phone has to switch to 2G or 3G. The alternative would be not being able to perform voice calls at all!

Wifi calling losing connection

Hi there,
I am trying to use WiFi Calling on my H8324. The thing is, it works but only temporarily.
When I start the phone with a fresh firmware update (or simply flash some oem_*.sin files for instance), the phone switches to WiFi calling even before it recognizes a network (which is a good thing). When I then go into airplane mode, I'm able to make and receive calls via WiFi without issues.
However, if I deactivate the WiFi mode and as soon as the phone registers with a network, WiFi Calling seems to go away and there is no way to bring it back. I've tried to reboot, disable / enable the sim, disable / enable the WiFi Calling option, tried to use only some specific network modes etc. The only way to bring WiFi calling temporarily back is to reflash firmware parts.
I have to add that I'm trying to make that work using a German blau.de sim card (O2/E-Plus network) in Canada. So I'm roaming and that's exactly the reason I would like to use WiFi Calling.
Does anyone have ideas how to solve that? Or maybe as a workaround: Is there a way to disable network registration for only one sim card? (I have the dual sim version and I'm using a Canadian SIM too). I can't use airplane mode activated all the time.
Thanks!
Update: Alright, I've found a workaround for anyone who might be in the same situation. WiFi Calling Sim must be SIM 2. Before registering with the network, activate the airplane mode, then activate WiFi. Now WiFi Calling should be working. Now go to Service menu *#*#4646#*#* and activate mobile radio manually. Now you have a working SIM1 and a SIM2 in Wifi Calling Mode.
I still need to figure it why this has to be done but so far this is a working solution. Unfortunately you won't see any notification icon for the data/voice connection for SIM 1.