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Questions tagged [cellular-radio]

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

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98 views

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 ...
1
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1answer
68 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 ...
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0answers
15 views

How to disable “phone functionality” in Samsung S4

I have an old Samsung Galaxy S4 (GT-I9505), Android 5.0.1, Kernel 3.4.0-5978264, which I wish to use as a PDA without phone/cell functionality. The unit is not "rooted". The problems it is ...
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0answers
160 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 ...
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0answers
68 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 ...
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0answers
41 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 ...
0
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0answers
43 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,...
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0answers
464 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 ...
0
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1answer
120 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 ...
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0answers
34 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 ...
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0answers
34 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 ...
2
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0answers
75 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 ...
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0answers
680 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 ...
3
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2answers
267 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 ...
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1answer
1k 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 ...
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2answers
3k views

Accidentally set radio to USA band

Accidentally set radio to USA band 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, ...
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2answers
112 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 ...
3
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0answers
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 ...
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1answer
291 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 ...
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1answer
780 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 ...
0
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2answers
3k 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 ...
1
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0answers
27 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 ...
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2answers
2k 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-...
1
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1answer
76 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 ...
6
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1answer
3k 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?
2
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2answers
3k 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 ...
1
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1answer
114 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 ...
5
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1answer
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 ...
2
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0answers
690 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 ...
0
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1answer
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 ...
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0answers
143 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 ...
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3answers
3k 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 ...
2
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0answers
54 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 ...
0
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1answer
58 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-...
0
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1answer
79 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?
3
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0answers
278 views

Nexus 5 Lollipop losing cell signal when wifi connected

I believe I first noticed this when I got version 5.1, and am still getting the issue with 5.1.1. If I keep the phone with wifi off, the phone works fine. If I connect to a wifi access point, at first ...
0
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2answers
737 views

Turn off radio layer hardware calls to save battery when your broadband hardware is gone

With reference to my question here: IM-A870L Radio Interface Layer broke down Summary: My android phone broadband chip is dead. For some reason, its not working anymore. Now I can use the phone for ...
3
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1answer
8k views

How to turn off cellular radio in Lollipop/JellyBean using adb?

I've been trying to find out how to kill/turn-off cellular radio (on a rooted device) using some command on ADB. My research only found that I should either (using GUI) enable Airplane Mode, or type ...
1
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1answer
250 views

IM-A870L Radio Interface Layer broke down

I am having this weird problem with my Vega Iron since a couple of days. Past 2 days the battery was down and phone shut off. I put it to charging and when I came back after couple of hours, the led ...
4
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4answers
21k views

Cellular data not working since 5.1 Lollipop flash

Cellular data stopped working immediately after "upgrading" to 5.1-lollipop OTA (from 5.0.2) on my Nexus-4. I am seeing the exclamation point in the signal strength indicator at all times, except ...
5
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6answers
15k views

Can my phone act as WiFi Access Point while Disabling Celluar Radio?

Can Android act as a WiFi Access Point while the cellular radio is turned off? I tried to accomplish that using flight mode, but that won't work. While flight mode is enabled, Androids portable Wi-Fi ...
0
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2answers
2k views

Enable LTE on Nexus 6 with Lollipop

My new Nexus 6 isn't giving me an LTE icon in my cell service - I get the same old H that was showing on my Nexus 4 before I upgraded. I'd expect to see LTE here : I talked to my carrier, who said ...
0
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1answer
2k views

bootloops / random restarts on Note 2 LTE, worse with SIM inserted? analyze kernel log “last_kmsg”?

when I started using my Note 2 LTE with an LTE sim card (tested LTE long ago without problems), running CM11 nightly from approx. 1 month ago, it started to reboot randomly. But it also happened with ...
0
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1answer
756 views

Cell standby use about 35-50% of total battery? [duplicate]

I have Micromax canvas 2.2 a114. I am in strong network zone and use 2g internet all time and time without network is 0%. So why it is consuming more battery. I also never in weak signal.??
15
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6answers
99k views

How can I find out which bands my phone supports

Background: I recently bought the Padfone X, and have been attempting to get it on my network. Part of this effort has been verifying information I have found online which claims that it supports LTE ...
1
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1answer
234 views

What are radio_dump .bin files? Can I delete them?

Each radio_dump_xxxxxxx.bin is 37MB in size.
4
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2answers
7k views

Interpretting the output of dumpsys telephony.registry

So when I run the command dumpsys telephony.registry | grep -i signalstrength I get the following output: mSignalStrength=SignalStrength: 99 0 -120 -160 -120 -1 -1 25 -93 -12 300 2147483647 gsm|...
14
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5answers
48k views

Is it possible to force an app to use cellular data instead of WiFi? [duplicate]

Our local office provides free public WiFi for phones and tablets, but blocks access in ways that means that some applications (like WhatsApp) are unable to connect. Is there any way to configure ...
4
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3answers
12k views

How to disable RIL on Android?

As soon as I connect a USB modem to android device, system grabs ttyACM0 and ttyACM1 in an attempt to open connection. As a result, the ports are blocked and can not be opened by other services. How, ...
0
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0answers
43 views

Does 3G has to start and stop with every transmission? (energy overhead)

Does anyone know what has to happen for 3G to send some data (when 3G is on in Android settings, using Nexus 4)? Does it has to initialize somehow at the beginning or to go back to some stable mode in ...

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