Disable VoLTE/VoWiFi carrier checks(dialer codes). - ZTE Axon 10 Pro Questions & Answers

My mother(77) has an Axon 10 Pro. I've turned VoLTE turned on in settings, but it's not placing calls with it for some reason. With my phone(Xiaomi Mi9) I had to use *#*#86583#*#* and *#*#869434#*#* to disable carrier check. Does ZTE have similar dialer codes?
Unfortunately she lives a considerable distance away so I'm unable to sit with the phone and try different combinations (aka, I have to make a list of what I'm going to do and schedule to go try them on a weekend)

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Note Edge 915T Wont let me call while on LTE - Help needed :(

Hello all..
I have this issue with my Note Edge 915T (T-Mobile Variant). It is unlocked and I use it in Venezuela with Digitel (LTE BAND 3: 1800) and the phone DOES connect to LTE with no issues (I get the 4G/LTE icon), and I can browse with no problems, but no one can call me, nor can I make any calls or text. In other phones, when I call, data drops and I can call and when I finish, data comes back up. HEre, LTE stays up and my call does not get through. Then after some tries, it drops to EDGE and won't pick up LTE until I reboot or something.
If I try a different operator, it goes to HDSPA (3.5G) and I get voice and data (data drops while calling, but it ir normal), but I want to use my operator with LTE.
Im running MM and I deactivated VoLTE as my carrier does not support it, but is there something else I'm missing?
This may sound stupid, but have you set your APNs? You can also try resetting your network. Dial ##72786#. Also Does your carrier require any certain apps. Example FreedomPop requires a specific app for getting/making calls, as they are mainly VOIP MVNO...
unimatrix725 said:
This may sound stupid, but have you set your APNs? You can also try resetting your network. Dial ##72786#. Also Does your carrier require any certain apps. Example FreedomPop requires a specific app for getting/making calls, as they are mainly VOIP MVNO...
Click to expand...
Click to collapse
Hi! thank you but yes, the APNs are perfect, I can use Data, the issue is that I cant call as the data signal stays in 4G/LTE and with my carrier, when calling, it drops data signal and it calls, here I can't. Im starting to think it has to do with CSC being with TMO, and I should use another one either from my country or a general One (BTU) for example. Will try to flash a rom from a different carrier to see if it works.
The only other option might be *#BAND# (2263),which could be dangerous, if you do not note original settings. Sometimes a complete ODIN can restore.
I normally use Nova Launcher - Widget- Activities- Somewhere under phone or settings. Shortcut Called PhoneInfo or DeviceInfo, which is much safer&consistently works! The app w/ same name no longer works. It took me forever & I always export my desktop, so I have that shortcut. The last option is an app called Samsung Phone Info+, but is paid or free if u know.... I really hate paid apps. It has under menu secret codes as well.

WiFi Calling - Setting Priority

My provider (O2 Germany) allows WiFi Calling (voice over WiFi) and I have activated it on my P20.
Is there an option to "Prefer WiFi connections when available?"
At home, the mobile networks only work near the windows. Within the flat, mobile calls often get lost so I am glad to finally have a phone that can use the WiFi network.
By default, the phone prefers the mobile network and only switches to WiFi when the mobile network is lost.
Can I set the phone to prefer WiFi and use that when available and only switch to the mobile network when WiFi is out of range?
I have read somewhere that Samsung phones provide such an option, but cannot find it on the Huawei P20 phone.
The only workaround I have found, is to switch on airplane mode and then manually switch on WiFi. That works and I can still make and receive calls that way.
I looked through Developers Options, but could not find any such setting.
Anyone?
I am searching also for that setting. My mobile network signal is to low to live and to high to die......
Would appreciate if that annoying P20 would give me the ability to decide how it should behave....
Thanks on any help!
The only way I found to force WiFi calling is to switch to airplane mode and then switch WiFi on again. Then the phone will remain constantly in WiFi calling mode. You just need to remember to switch off airplane mode when you leave the house.
I just got angry after my post an treated Google.
For the Moment i found a solution, hope that will persist...
If i go to the dual SIM Config Menu there is an option to activate LTE on both SIM Cards. It is, in my German Branded P20, the last option.
When i disable that option as mentioned on the Internet the phone takes 5s and switches automatically and, for the moment, permanent to WiFi Calling...
Crazy. Hope that solves the issue foe me permanent and maybe helps for you also?
I think there is no bigger disadvantage on deactivating the function when WiFi Calling is now working properly
I just received a new firmware update to EML-L29 8.1.0.165(C432) which adds VoLTE and VoWiFi features - I thought we already had those features, but maybe they have improved them. I have not seen any new settings and even with your suggested settings, I am not getting permanent VoWiFi.
Hi Peter,
after some days testing i have to report, that was happy to early...
Just not reliable, also with my "hack", which also caused me some other troubles in regions were i have the issue that the carrier has just build LTE transmitters and no other frequencies.
Also, WiFi Calling works not really reliable on Huawei P20. Annoying!
So we have to hope that Huawei will bring a fix for that....

Manual network selection broken?

I'm living in a border region where my phone frequently switches to the abroad network in cases where the signal of my domestic operator fades. So I manually select my domestic network in the settings. However, my manual selection doesn't stick and the OP7 returns to automatic network selection once it loses signal of my domestic operator. This results in frequent connections with the abroad network and excruciating costs.
Solutions I've tried:
- manual switching networks: as described above, manual network selection doesn't stick
- 3rd party apps: I found an app which warns me when I connect to an abroad network which isn't very helpful since by the time I get the warning, the connection has already been established and the costs have incurred
Does anyone have a similar problem and possibly a working solution?
turn off roaming?
I'm using an abroad (German) sim so turning off roaming is is not an option. Just wondering if it's a bug in oxygenos that my OP7 keeps ignoring my manual network settings, which would be a perfect solution if it just worked.
Same problem here OP7. Roaming in Poland atm and if set to automatic no data. If I select a provider manually, it works less than 4 minutes and then switches back and data goes away.
Same story on 8T, this is not acceptable at all!
I was so happy with this phone, but this will be my last OnePlus phone.

Oneplus 7 Pro T-Mobile (GM1915) on verizon, is VoWIFI possible?

Hello,
I recently purchased a T-Mobile unlocked Oneplus 7 pro (GM1915, 8GB ram/256GB storage) on eBay to use on Verizon, and I can't seem to get wifi calling to work. We went through the setup with Verizon, and let them know it was a CDMA-less device, and everything works perfectly besides wifi calling. I do not have the option to turn on wifi calling in the settings of the phone or the log kit. When I dial *#*#4636#*#* in the phone app to get to the phone info, the VoLTE provisioned slider is enabled and able to be turned on and off, but the Video Calling, Wifi Calling, and EAB/Presence Provisioned sliders are all greyed out and disabled. I called Verizon to check on their end if it could be enabled, and he said it was enabled on my account, but it still wasn't working on my phone. He put in a ticket to verify the E911 address, but after reading a lot of threads on forcing VoWIFI on other models, I just wanted to see if it was even possible, as I saw next to no threads on my specific model of 7 pro. If anyone has any guidance for me on this issue, I would really appreciate some help.
Thank you!
Won't work. The phone is not a Verizon phone and will be refused access to the vowifi server. Only the pixel ever functioned. Sms over WiFi will work with the Verizon messages app or Google messages and rcs. You best option is Google voice for vowifi.
Welcome to Verizon where unlocked 5g phones don't work on 5g either.
Fully possable

Question Force disconnection from mobile network on one SIM

I'd like to force my Pixel 7 to disconnect from any mobile network, without using airplane mode. Do you know a way to achieve this?
Reason for asking this: I will travel abroad and use a secondary SIM to provide me with data, while using my primary SIM with voWiFi (or Backup calling). That'd would keep me reachable on my phone number and allow me to make calls/SMS @home at local rates.
The reason for having my primary SIM disconnected from any mobile network is due to the fact that my primary carrier will charge me for calls/SMS depending on the latest place I got connected to a mobile network. They charge roaming fees even when you're using voWiFi in airplane mode! I have tested this already on a previous trip.
One way would be to select a network manually, or a network that I know it won't connect. However, if I turn on and off airplane mode (to take a flight), the phone will connect to the latest network it connected successfully to.
So my strategy is to connect manually to my home network at home, hoping the phone doesn't magically connect to a network. That's why, I'd like to really make sure that the phone can't connect to any mobile network, just to be sure it won't connect to a network while roaming. But only on the primary SIM. For the other SIM I do want to get connected.
For those wondering, my carrier is T-Mobile NL.
Try messing up the apn details on your sim when abroad. That will prevent connection
The issue is that messing with apn won't prevent the phone to register to a roaming network. That alone will tell my carrier where I am and charge roaming fees accordingly...
@jasalta387 Interesting problem for sure. Can you forward your calls to the secondary (travel) sim and use WhatsApp or Signal to call on wifi? Or leave an auto message giving your foreign number. Any time you connect to the primary network you will be charged, no two ways about it on an Android device. I do believe the iPhone has that capability however. Even if you receive a text on the primary you will trigger a roaming charge. Perhaps the only way to avoid that is turning off the sim entirely while traveling. See if they have an inexpensive international plan?
Indeed, iPhone can easily be disconnected from a cellular network by selecting one that doesn't register. That setting sticks even while cycling through airplane mode or a device reboot. On Pixel this is not the case. Pixel will register again, hence my issue.
I know I could rely on 3rd party apps or services or call forwarding. Problem is that I then need to redirect all people who could reach me to them somehow, while using wifi calling is just fine. Even SMS come and go through it. I just need to not make my carrier aware I'm overseas. Hence my question.
I could use a second device that provides me data and keep my phone all the time in airplane mode. This needs that I carry the two devices all the time with the logistics of charging two phones and all of that. I just want to do it all with my Pixel.
I was thinking one thing: I need to go to the US. Is 3G dead there for good? Because then I could tell my Pixel to use 3G and not allow 2G. That'd keep it away from any accidental network registration upon landing.
jasalta387 said:
Indeed, iPhone can easily be disconnected from a cellular network by selecting one that doesn't register. That setting sticks even while cycling through airplane mode or a device reboot. On Pixel this is not the case. Pixel will register again, hence my issue.
I know I could rely on 3rd party apps or services or call forwarding. Problem is that I then need to redirect all people who could reach me to them somehow, while using wifi calling is just fine. Even SMS come and go through it. I just need to not make my carrier aware I'm overseas. Hence my question.
I could use a second device that provides me data and keep my phone all the time in airplane mode. This needs that I carry the two devices all the time with the logistics of charging two phones and all of that. I just want to do it all with my Pixel.
I was thinking one thing: I need to go to the US. Is 3G dead there for good? Because then I could tell my Pixel to use 3G and not allow 2G. That'd keep it away from any accidental network registration upon landing.
Click to expand...
Click to collapse
I'm intrigued by this and would love to find a solution for you. Oh yeah, 3G is dead across the US from all reports. So I'm trying to parse this scenario, let's see if I get this right. You want to have phone calls come into your primary phone line (Sim 1) but no network connectivity for data, right so far. Also you want SMS to the primary while roaming. The problem is that even if you don't get a phone call or text the connection to the network alone will trigger a billing instance, right so far again?
My daughter has an iPhone and turns off data on the sim but can get phone calls and text. As soon as she does though there is a daily billing charge of $10 because she's outside the US. I also think she can connect to wifi and make calls and text without a carrier network. But I'm not sure about. But that aside, how would you like it to work? Would you like it to connect to the network but not get charged unless you get a call or SMS? Because once a call comes in you're roaming charges will ensue. In airplane mode and strictly wifi there should be no charges but you say they bill you anyway right? Are you sure you didn't get a text or something to trigger the charge? I hope I'm reading this right.
My carrier bills calls and SMS based on the country of the latest connected cellular network. So if I don't connect to any network while I'm abroad my carrier will think I never left the country.
I don't want neither data nor calls/SMS on my primary SIM using cellular while abroad. I can get all calls and SMS via WiFi calling on that primary SIM. To get WiFi calling when I'm abroad I will use the data connection on my secondary SIM or any WiFi network.
Because of the need to get the secondary SIM on, airplane mode doesn't help me. So I need my primary SIM to never to any cellular network while I'm abroad.
jasalta387 said:
My carrier bills calls and SMS based on the country of the latest connected cellular network. So if I don't connect to any network while I'm abroad my carrier will think I never left the country.
I don't want neither data nor calls/SMS on my primary SIM using cellular while abroad. I can get all calls and SMS via WiFi calling on that primary SIM. To get WiFi calling when I'm abroad I will use the data connection on my secondary SIM or any WiFi network.
Because of the need to get the secondary SIM on, airplane mode doesn't help me. So I need my primary SIM to never to any cellular network while I'm abroad.
Click to expand...
Click to collapse
And if you turn off the sim then even WiFi doesn't work on your primary number?
If the SIM is turned off, then you don't get WiFi calling
Try the 4636 menu
Choose the SIM you want from drop down
3 dot menu top right
Disable data connection
jasalta387 said:
If the SIM is turned off, then you don't get WiFi calling
Click to expand...
Click to collapse
Is it possible to adjust the order of airplane mode / network /wifi on-off so as to not allow the sim to connect to the network but still allow wifi on the sim? So for instance, disable the sim, turn on airplane mode, turn on the sim and then enable wifi calling while in airplane mode, turn off airplane mode with data turned off on the sim. I can't believe with no data, calls, sms and only wifi the carrier will charge you roaming. That just doesn't seem right.
bobby janow said:
Is it possible to adjust the order of airplane mode / network /wifi on-off so as to not allow the sim to connect to the network but still allow wifi on the sim? So for instance, disable the sim, turn on airplane mode, turn on the sim and then enable wifi calling while in airplane mode, turn off airplane mode with data turned off on the sim. I can't believe with no data, calls, sms and only wifi the carrier will charge you roaming. That just doesn't seem right.
Click to expand...
Click to collapse
@jasalta387
I don't know if you would follow this suggestion...
But in case you are interested in it, this sounds like something you could pull off automatically with something like MacroDroid or Tasker or some other automation app -- even without being rooted! But I concur, it doesn't make sense that a carrier charge roaming when there would be no data, calls, or sms but only wifi....I'm of the opinion (previously stated somewhere in the thread here) that you might've either misread the bill and/or accidentally "caught" a text or transferred a byte of data and it triggered...
Hey there, I know it sounds harsh that a carrier bills this way. It is verified and discussed in a local forum here (in Dutch) https://gathering.tweakers.net/forum/list_message/74880578#74880578
Of course, here there are a few things at play:
1- the carrier wants to have a clear way of communication and support. If you are abroad, those are the prices you pay for. That's it. You know it for sure. They don't want to have to explain how to turn on VoWIFI and explain how to make that working for every phone, or explain to you that you made a call thinking you were on VoWIFI while you weren't. Their approach is crystal clear.
2- the carrier makes some extra income this way. While travelling in the US: for every SMS sent they charge 0.51 EUR, calls placed 1.27 EUR, calls received 0.76 EUR and 2.50 EUR per MB of data. For data, they sell some passes that makes the price more reasonable. Note that unlimited plans for domestic data/calls here start at 25 EUR per month.
3- In The Netherlands (and for pretty much every country in EU) people rely quite a lot on 3rd party apps for calls and texting, especially when you are abroad. WhatsApp is the go-to service, even for domestic communication. People don't even bother using their home carrier when travelling outside of EU. They just remove (or disable) that SIM. So the high cost of roaming is usually left to business users for which companies pay or make better deals with the carriers.
One thing I didn't mention is that in NL, pretty much all carriers limit VoWIFI to Dutch IP addresses. To use VoWIFI you'd need to use a router that tunnels all IP traffic via a VPN that has an exit point in The Netherlands. That's how I conducted my test and verified that all activity using VoWIFI was billed using the same fares as if I was using a roaming cellular network.
I want to try this using a secondary SIM from a Dutch provider, which will give me the Dutch IP address. Backup Calling on my primary SIM will make that SIM to connect to VoWIFI. But to get my home fares, I really need to make sure that my primary SIM doesn't connect to any network while I'm travelling (hence my original request).

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