I have a fully-patched Pixel Fold with the latest version of Android. If I boot into airplane mode with no SIM cards installed while the “NR only” option is enabled, as soon as I disable airplane mode, the phone immediately connects to a GSM (2G) network, opening my phone up to 2G attacks despite having no SIM card. My expectation is that these connections would be blocked. I also see that the phone occasionally makes UMTS and WCDMA (both 3G) connections in this mode as well, even though 3G is supposedly defunct in the United States. My expectation is that these connections would also be blocked. If I then enable a network (i.e., Cricket or Visible) that seems to only support 5G in the form of 5G Non-Standalone (NSA) (4G+) (again, with “NR only” enabled), the phone proceeds to connect me to LTE, sometimes simultaneously with an NR network (with null MCC/MNC values and a TAC value of 0). My expectation would be for the phone to report no service. So not only is “NR only” not NR only (it allows 2G, 3G, and 4G), but if I enable airplane mode, both \*#\*#4636#\*#\* and the CellMapper app continue to report that my phone is always connected to various cells over 2G, 3G, 4G, and 5G, the latter two with a SIM cards installed and the former two without SIM cards installed. Is “NR only” just “prefer 5G, otherwise connect to anything”? Does “NR only” include 5G NSA, which necessitates allowing LTE (making the option identical to “NR/LTE”)? Shouldn’t airplane mode entirely disable the mobile radio? It seems if “NR only” is not literally “NR only”, then there’s no defense against the attacks described at https://www.mdpi.com/2624-800X/4/1/2 (which leverage 2G, 4G, and 4G+ (AKA 5G NSA)).

My phone is a Huawei Ascend Mate7. I get the following notification whenever I turn on my 4G connection: > **Data lost** > > You have lost data connectivity because you left your home network with data roaming turned off The problem is my SIM card is from the same country I live in now. This problem somehow remained since I moved from my old SIM card, and now I can't seem to get rid of it. I also see an "R" next to the connection indicator. How to solve this?

I have a Samsung Galaxy On Max and inserted two different carrier SIM cards, Jio4g and Airtel. It has been written that this device is dual SIM 4G. It was working fine till I was using Jio 4G as my LTE network and for mobile data as well, but when I recharged my Airtel SIM card and switched it to 4G, my Jio SIM was disabled (Jio doesn't have 3G/2G connectivity). So it means I can use only one SIM with 4G enabled. On the basis of the device model, it supports 4G SIM on both slots but not at the same time. It means it does have an SoC that can handle LTE networks on both SIMs. My concern is, can Samsung provide some update so that users can use both SIMs as 4G (LTE) simultaneously?

I have an Android phone with 2 SIM slots - however, it requires me to select 1 sim for data, and whichever SIM is not being used for data is forced to use 2G. Is there a way I can force the phone to use both SIMs on 4G?

My mobile carrier is upgrading their network from 3G to LTE. I'm using a LG V20 phone, model LG-H915 to be precise. So far, I have been contacted twice by them, claiming that my phone and SIM card should be replaced because of this. They have even offered me a new phone, but I have declined since the model they offered is a cheap one. There are good reasons to change for a new device, that's true. For one thing, my current phone is running Android 8, which is, well, very outdated to put it mildly. The battery, which is the original one as I never replaced it, seems to be draining a bit faster as well, but it's hard to tell. However, I'm not sure about the network thing. I did a bit of research, and as far as I understand, the V20 does support LTE, so I should be fine with the new network. In fact, when I activate mobile data (I usually keep it deactivated unless I actually need it), I see a LTE logo appears, and if I check in the phone's settings, it actually says that the network is indeed LTE. From Settings-­>Network->Mobile Networks : From Settings->General->About Phone->Network : So, do I understand this correctly and in fact do not actually need to change phone (well, not because of the LTE network, anyway)? Or is my mobile carrier correct about this?

My Pixel 5 audio is working while on WiFi at home. When I'm not on WiFi and using 4G, any video on Facebook or YouTube has no audio. On Facebook I can turn the audio off and on for each video, doing so makes no difference. I can't see volume controls anywhere in the YouTube app, either on each video, or in the app settings. In Android Settings > Audio, all audio levels are high. Why would audio not work on any Facebook or YouTube videos while on 4G? The problem has followed me to a new Pixel 6a too.

I am trying to turn my old phone (Xiaomi Mi 5) into a 4G proxy server which I can use with different apps for scraping data, etc. I have been searching on how to set it up and I found some articles, but they are not very clear. I am really a newbie and I have no idea how to set it up. I have bought 2 Android apps: Proxy Server Pro and Servers Ultimate Pro having trouble configuring it. These are the steps I have followed on Servers Ultimate Pro: - Add a proxy server - In the General tab, I didn't touch anything - In the Rules tab, added a new rule - HOST CONTAINS: I put my public IP address which I found at https://myip.com - REPLY WITH THIS IP: 127.0.0.1 Port: 1080 Now, when I try to test it I, get no connection.

I used to be able to turn off VoLTE, but since a recent update, if I select 5G, VoLTE can't be disabled anymore (it is grayed out). I don't mind it being on, I just want to hide the icon. If I select 4G I can disable it. That's what's working for me now. But then I can't use 5G connectivity.

I'm using Xiaomi MI4. In India it doesnt support 4G bands, is there a way to unlock 4G bands for this device?

"Unfortunately, the process com.android.phone has stopped" error occurs when i try to change my network mode to LTE only. The phone i'm using is Samsung J5(SM-J500H).

A strange request I know... but I am quite keen to disable mobile data from my phone permanently (as opposed to just switching it off in the settings) so that I can only browse the internet when I'm connected to Wifi. I've tried getting my network provider (O2) to do this with my account but they said it's not possible. Is it possible to achieve this in Android instead? I'm basically just looking for a way to 'break' it... whether that's by installing some kind of app then that would be fine (perhaps if I could then return it back to normal with a factory reset)

I'm using AdAway in VPN mode to block all ads on 3 phones and sometimes apps and sites won't load at all or load slowly. I'm using 4G+ and getting 50 mbps download speed. Phones are Realme Narzo 50 5G and 2 Motorola Moto G50 5G. All sites and apps sometimes freeze during loading, like every 10 loads there is a freeze or very slow loading.

My phone is a replicate of the Huawei P8 called p8 lt Dual sim Android 6.01. After I used an app called Network Mode Universal to enable LTE on my phone, the signal disappear and I can't use my CDMA SIM anymore. At first, all I did was change the mode to LTE only. Then I tried other options, but nothing works. Other than that, GSM seems to work fine. > > I tried restarting my phone, resetting my network, and using another CDMA card but nothing works. How I can reset my configuration?

I recently removed my SIM and put it back in again. From then on my SIM does SMS and calls only when I turn on LTE in the mobile network section. Even if internet is off it works with LTE. Why did this happen? What would happen if I put the SIM in another cell phone? In my cellphone both call and SMS are gray and not active. Even if LTE is on they are off, but I do get SMS/call. What could be the problem?

My phone (Xiaomi Redmi Note 10, Android 11) spontaneously disconnects from the mobile internet after being connected for a couple of hours, and it **won't** automatically reconnect. Can stay unconnected for however long. After I switch to the flight mode and back, it reconnects for some time, then loses connection again. Is there any way to **diagnose** what is the problem? Maybe to find some **logs** from the network hardware. I thought this might be due to a defective SIM card because the same problem happened to the phone it was previously installed in, but I had SIM card reissued at a mobile operator's office. The same problem is there with the new SIM card. What's the chance it's defective again? ¯\\\_(ツ)_/¯ **UPD 2:** Turned out that 4g connection always disappeared during a call, and not just spontaneously as I originally thought. **UPD 1:** A little clarification: when internet is Ok the signal level has a 4g label, then in an hour or so the 4g label spontaneously disappears, and so does the internet connection. But the phone does calls and receives them. Thanks to Robert I managed to get logs by

adb logcat -P "" # and then after waiting for the internet to vanish
adb logcat -b radio

A lot of messages say 2224 at the presumable time of failure such as

: error apn=internet.tele2.ru, cause=2224, requestType=NORMAL

This describes it as "SIM was marked by the network as invalid for the circuit and/or packet service domain." _How could this happen_ after sim worked fine for the previous 40 mins? _Is there anything I can do to prevent it?_ Here are the logs, but after seeing what a mess they are, I wouldn't expect anyone to look through them. But if you actually do, the logs start with turning the airplane mode on and off, then a lot of messages start at 22:31 (where the loss is probably is) then by 23:01 there is definitely no internet connection. Any help is much appreciated.

Sometimes it's desirable to use a device on a carrier that does not officially sell it. Often this is due to regional differences and travel (for example, using a US phone in Europe) but also because some carriers simply do not offer phones that other carriers do. How can I determine if it's possible to use my phone on a different carrier, and which carriers it is compatible with? ----- *This community wiki is intended to be a canonical answer to a common question. If you feel that improvements could be made then please edit the post(s).*

So I am using Vivo V7 on an airtel 4g data connection and every time I try to open apps like swiggy or foodpanda I get a message saying "there was a problem" "please try again later. However when I open these apps on a wifi they work fine. What is going wrong here??

The following screenshot is from Realme 8 which has a max UL/DL of 15000/30000. The next screenshot is from Asus Zenfone Max Pro (M2) which has a max UL/DL of 51200/102400. The problem I am facing in my Android is this - After some time using 4G, the sign shows 4G but the speed drops to 0.01kbps. This goes on frequently until I reset the network by firstly selecting 3G/2G and then selecting 4G/3G/2G. Can I edit these values using ADB shell so that I can set 51200/102400 as the max UL/DL value in my Android? Can someone provide any fix to this problem?

I'm told by Verizon that the Z3v will be unable to access mobile data while in a call until January. If only they told you this *before* the sale! In any case, does anyone know of a workaround, or a way to get the software update early? I considered flashing something from Sony's developer world, but as I understand it this will impact camera functionality... Any known way to get around this without waiting until Sony/Verizon push the update? "Mobile data not available" (click image for larger variant)

I have android camera vehicle mounted device. When install operator public network LTE sim, device is successfully connected to network but when install company private LTE network sim device is not connecting. When we try troubleshoot via adb observed no any IP assign to device with private LTE What are the commands available to network troubleshooting via adb