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Questions tagged [cellular-radio]

Use this tag for questions related to the cellular radio communication in a device (not necessarily the firmware)

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Is there a way to leave bluetooth on while turning cell service off - a near airplane mode?

For my Google Pixel 4 on Android: I often go sailing out in the ocean or motorbiking in distant woods where there is no cell phone signal. I want to leave Bluetooth on so I can listen to podcasts, ...
foolishmuse's user avatar
0 votes
0 answers
68 views

Any way to force cellular network refresh?

Cellular coverage where I live is very spotty, to the effect I can essentially draw lines on a map and say "on this side, I probably have coverage, while on the other side I almost certainly don'...
Matthew's user avatar
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1 answer
55 views

Can I use a US SIM card on my xiaomi Note 8? [closed]

I am trying to use my Verizon SIM card as well as a SIM card from airvoice wireless on my xiaomi Note 8. It says that it's reading the cards but I don't know how to enable them if I can.. Please help?!...
Julia Babb's user avatar
1 vote
0 answers
238 views

Force WiFi calling of SIM2 over data of SIM1

Is there any way I can disable the radio of SIM2 so I can only have 1 active SIM and 1 WiFi calling? Can I use ADB to achieve this, or anything else that doesn't need root or bootloader unlocked?
Woody Regan's user avatar
0 votes
2 answers
180 views

How to read signal strength of all frequencies received by antennae

Since all smart phones have antennas, and these antennas are capable of detecting and receiving many types of signals including wifi, 2g, 3g, 4g, and 5g, then "we" should be able to make ...
hoatzin's user avatar
  • 101
1 vote
0 answers
272 views

On Android 13, is there still a 2G kill switch?

A feature was introduced in Android 12 that prohibited 2G usage (except for emergency situations), that’s sometimes called the 2G kill switch. However, I now have a Samsung Galaxy A04s and the switch ...
NovHak's user avatar
  • 146
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0 answers
19 views

Android devices take upto 10 minutes to acquire cellular reception after boot while roaming

When I boot android device having a SIM on roaming it took around 2-10 minutes to get cellular reception. I've tested this on multiple devices, similar behavior. One interesting thing is, if device is ...
Al Mamun's user avatar
  • 101
4 votes
0 answers
332 views

Pixel 6/7 on Android 13 drops cell if it doesn't connect to IMS

I'm looking for some help in finding a workaround for the pixels (6 pro, 7) dropping 5g nr connection due to lack of ims registration on Android 13 and 14. My device is running build: tp1a.221105.002 ...
Stans Hands's user avatar
1 vote
0 answers
649 views

get cellInfo with adb

I want to get the information inside cellinfo using adb command, but tac, lac, ci and cid are hidden. How to get these? for example: mCi=9*****68 mTac=3****1 command: adb shell dumpsys telephony....
mohsen's user avatar
  • 31
2 votes
0 answers
343 views

Getting ModemServiceMode with adb

On Samsung devices, how to get the ModemServiceMode page (*#0011#) with ADB commands?
mohsen's user avatar
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1 vote
0 answers
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Pixel 6 can't connect to n48 (5g SA)

TL;DR I have a Google Pixel 6 and I am able to see my private PLMN but attempting to connect will show instant text, "couldn't connect". No logs in my 5g core, and no registration attempt. ...
Darker labs's user avatar
1 vote
1 answer
144 views

Can I install an uncertified eSIM profile provisioned by myself on Android?

I would like to set up an SM-DP+ server to provision my own eSIM profiles. These usually get certified by GSMA and are used for large-scale Remote SIM Provisioning, but I would want to use this for ...
OerllydSaethwr's user avatar
1 vote
0 answers
337 views

How can I tell if an Android device is locked to a specific carrier?

I want to know if an Android tablet is specific to a cellular carrier (T-Mobile, Verizon, etc.). The particular one I have in my hand now is a Samsung Galaxy Tab A, but I have multiple types of ...
TonyPace's user avatar
3 votes
1 answer
306 views

Salvage Android Phone as Linux-Server (radio/wifi hardware broken)

My device has hardware problems with radio/wifi. Hence it's not possible to use sim-card or wifi. That also makes it restart frequently. Now it's useless as a phone. So I am trying to turn it in a ...
imbr's user avatar
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0 answers
31 views

Is it possible to control and transmit electromagnetic radiation of allowed frequency with Android device?

I understand the following things about smartphones A smartphone has various hardware that functions wirelessly by transmitting and receiving electromagnetic waves. Things like Wifi, Bluetooth, and ...
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2 votes
0 answers
45 views

Save all radio communication to file

I have a rooted phone. So, your phone has a radio right? It does calls, uses network, et cetera. Can you access the radio with root permissions? How could I log all raw radio communication to a file?
apchrkey's user avatar
  • 101
2 votes
1 answer
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No service on Blackview BV 5500 Pro with Lineage 17.1

The issue I installed Lineage OS on my blackview BV 5500 Pro and am facing the "No Service" issue since. There does not seem to be any hardware issue and I've exhausted all the options I ...
Clément's user avatar
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1 vote
1 answer
2k views

Why do cell phones don't really turn off (unless battery removed)?

I've known this for a long time. A quick google confirms that many people think the same. Basically, that when shutting down a cell phone, the antenna still communicates with the tower. Triangulation ...
DraxDomax's user avatar
  • 111
1 vote
2 answers
17k views

APN Settings: What Does Each Setting Do?

An Access Point Name, APN, is a gateway between mobile networks and the public Internet. I've done research, and there's not much online about what the individual settings are or do. This is what I've ...
siriusstack's user avatar
1 vote
0 answers
413 views

Can an app manipulate the cellular radio chip?

I have a few ideas for a couple local cell to cell apps, but want to use the radio signals to extend the range (the extra work is fine with me). Just curious if it is possible to control the ...
ThatCampbellKid's user avatar
0 votes
0 answers
63 views

How to solve Signal Cellular off error?

My android 9 phone acting slowly yesterday, so I restarted it. Then its cellular signal icon on top get crossed from left to right. I googled it and that is a "Signal Cellular off" icon. Now my phone ...
Kaninchen's user avatar
  • 101
0 votes
0 answers
223 views

What is the difference between two AT-command interfaces

Qualcomm SDM660(modem- MSM4114), Mi A2, Android One 9(stock), 2 sim I founded two devices(not links), that can recieve at commands and answer them. Its /dev/smd8 and smd11. Smd7 is owned by root:root,...
PHPoenX's user avatar
  • 111
1 vote
0 answers
2k views

How can I lock device on a particular network frequency using android kernel sources?

Motivation My goal is to select or lock LTE frequency bands on mobile devices with Qualcomm chipset. On some devices like Samsung Galaxy S5, we can access hidden menu: *#2263# to select the radio ...
Vatish Sharma's user avatar
0 votes
1 answer
273 views

app or widget or other solution for turning just cellular radio off/on

I recently acquired an umidigi one with android 8.1 oreo naked/stock image in place and voice over wifi as well as voice over lte support. When device is in location with wifi connection, which is ...
myusrn's user avatar
  • 101
1 vote
0 answers
37 views

Which component of the Android protocol stack performs cellular encryption?

I understand that the SIM Card plays a significant role in generating keys for the encryption and decryption of cellular traffic, but are these keys passed to the Android architecture so that it can ...
Jason Taylor's user avatar
1 vote
0 answers
39 views

How to enable the radio transmitter on yureka

So just a couple of hours ago, I unlocked the device's boot loader and after boot up, I noticed a strange app in the app drawer which was called radio transmitter. I excitedly opened the app. But, the ...
Suhrid Mulay's user avatar
2 votes
0 answers
82 views

Moto G4(XT1625)Funny behavior with sim card inserted

I have a Motorola Moto G4(XT1625, Amazon Prime Edition) on US Cellular. Data doesn't work(sim status screen shows connecting or disconnected but never connects), the signal fluctuates somewhat, and ...
Robert789's user avatar
0 votes
0 answers
751 views

Unfortunately radio has stopped

Suddenly the built in radio application cannot be started anymore. I do not know if I changed something, but I couldn't find how to fix it. What is the possible cause? PS: I did a soft reset, and I ...
sancho.s ReinstateMonicaCellio's user avatar
4 votes
2 answers
458 views

Can I really tell where the tower is that I'm connected to?

I've been having some difficulty keeping a reliable connection at my house, so I installed the OpenSignal app to see what might be going on. According to its map, I live in a "hole" between several ...
AaronD's user avatar
  • 186
1 vote
1 answer
3k views

Can an android phone be converted to SDR using its radio hardware interfaces?

I have recently been reading about SDRs and based on what I have understood so far SDR consists of a radio hardware capable of transmitting and/or receiving radio signals within a given radio spectrum ...
AguThadeus's user avatar
1 vote
2 answers
4k views

Accidentally set radio to USA band on Moto G4+, no way to revert it back

I have Moto G4+ and I was playing around with *#*#4636#*#* and accidentally set the radio band to USA Band. Now there's no way of changing it back, so now I can't even connect to a network, let alone ...
Abraham Murciano Benzadon's user avatar
0 votes
2 answers
149 views

In Google Voice, do all SMS messages have to be transmitted via a data connection?

If someone is using Google Voice, do they need a data connection (cellular or WiFi) to be on in order to send/receive any SMS messages? This seems to be a big limitation, as keeping data on all the ...
End Anti-Semitic Hate's user avatar
3 votes
0 answers
3k views

Cellular radio dead? No carrier signal, "No service", no mobile networks

I own a Motorola Moto G 4G (XT1040). Original stock ROM, Android 5.1, unlocked bootloader, custom TeamWin recovery, rooted. I only install apps from Google Play, F-Droid or trusted sources. Last ...
That Brazilian Guy's user avatar
1 vote
1 answer
339 views

Why can't my phone connect to cell network data?

I have a Nexus 6P running CyanogenMod 13.0-20160819-SNAPSHOT-ZNH5YAO0IN-angler based on Android 6.0.1. I used to be running a CM nightly build and my cell carrier is Ting. Here's what happened: I was ...
strugee's user avatar
  • 308
1 vote
1 answer
813 views

Marshmallow: Changing and connecting to an APN

Okay, before anyone can downvote this or anything silly, I need to clarify a few things: This is for Android 6.0 (Marshmallow) I'm using a FlashFire-Rooted Cherry Mobile One (technically called ...
ronelm2000's user avatar
0 votes
2 answers
6k views

Is it possible to completely disable radio signal in a phone without a SIM card?

I have a Samsung Galaxy S4 Mini, powered by CyanogenMod 13 (Android Marshmallow 6.0.1), which I use as Wi-Fi only, being it without SIM card. The device antenna, though, seems to be constantly ...
Grimoire's user avatar
  • 2,969
1 vote
0 answers
30 views

Nexus 6 on T-Mobile loses ability to send texts. Factory reset does not fix

What is wrong with my mom's nexus 6. She was running stock Google Nexus software and kept encountering a problem where her texts would not send. I think I fixed it once by deleting the cache of some ...
user2355058's user avatar
0 votes
2 answers
3k views

Can I flash a separate radio image and have a working radio?

I have a rooted LGE Nexus 4. Installed on it are the Team Win Recovery Project and CyanogenMod 13 (Android 6). I found this guide to installing stock Android 6 onto a Nexus 4, and it provides pre-...
cat's user avatar
  • 131
1 vote
1 answer
106 views

Find out available mobile network bands in my area and disable scanning for unused bands

I have an HTC 626g+ which was supposed to be released in India, but I'm using it in Russia, which probably has different cellular frequencies available. I've read on certain forums that smartphones ...
user1306322's user avatar
7 votes
1 answer
4k views

Display Name of Connected Cell Tower

On older Nokia phones, the name of the cell tower you were connected to was displayed, often the name of the neighborhood you were in. Is there a way to view this data now?
yoyo_fun's user avatar
  • 335
2 votes
2 answers
5k views

Can you use cell tower triangulation without a SIM card?

Since cell phones can call 911 without a SIM card present, it is clear that they can connect to a cellular network to which they are not subscribed. Is it possible to use this knowledge to do cell ...
Ben's user avatar
  • 21
1 vote
1 answer
124 views

How do I troubleshoot inconsistent call quality?

I have a OnePlus One phone that has worked great for a long time, but for the past few months, my call quality has been inconsistent. I am on the newest stock rom - Cyanogen12.1.1-YOG7DAS2K1, build ...
SomeGuy's user avatar
  • 315
5 votes
1 answer
1k views

My phone is not connecting to the cell network (No Service)

I have an Android KitKat based phone. For over a week the phone is getting poor (at times) or no reception but the WiFi and bluetooth is working. There is a cross near where the range is shown and I ...
daltonfury42's user avatar
2 votes
0 answers
718 views

Droid turbo radio off when no signal happen, then can't turn radio back on

I just bought Droid Turbo (XT1225) from ebay, everything works fine except the radio, when the phone receive no signal for example in a lift, radio will turn off by itself and can't turn back on. The ...
Thomas G. Lau's user avatar
0 votes
1 answer
2k views

Will the 2015 Nexus phones (5X, 6P) work with any US cell provider? [duplicate]

I'm pretty geeky, but I haven't really followed all the tech behind LTE rollouts and wireless bands and whatnot. I barely know the difference between CDMA and GSM. I know Verizon didn't use a SIM and ...
mattdm's user avatar
  • 1,229
1 vote
0 answers
150 views

Having problems with carrier activation and connecting to cell network

I have a Sprint HTC One (m7wls) and recently switched over to Ting. I was using Cyanogenmod and couldn't use Ting's instructions for activating with them, so I used an RUU from HTC to get back to ...
skagzilla's user avatar
  • 111
-2 votes
3 answers
4k views

Why won't Android switch between wi-fi and 3G seamlessly?

I don't even know whether this is a good question. But it's annoying me and I don't get why it works so badly for me, and it's annoying me that I don't get it. Point is, when switching from one ...
MarijnvdZaag's user avatar
2 votes
0 answers
58 views

Galaxy S4 refuses to gain signal after being disconnected for a period of time

So, the scenario is this: I have a Verizon Galaxy S4 (SCH-I545, Android 5.0.1). One of my work sites is an amazingly effective dead zone. No signal whatsoever. If I enter the dead zone for a few ...
Anthony Hernandez's user avatar
0 votes
1 answer
81 views

Use cellular when connected to wifi

Is there a possibility to force an android phone to use cellular data when connected to wifi. For iOS I've found this https://apple.stackexchange.com/questions/173894/can-i-connect-to-wifi-but-still-...
nilskober's user avatar
0 votes
1 answer
94 views

Is my android when turned on constantly sending radio data to my provider? [closed]

Is my android when turned on constantly sending radio data to my provider so he can track me, or only when i am actually using the network by surfing or calling someone?
Junior J. Garland's user avatar