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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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 ...
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1 vote
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28 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 ...
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Android Emulator cellular speed limits does not work properly

I need to limit cellular speeds in Android Studio's Emulator. I tried to limit it from default settings: but it does not work. Each time I select anything lower than LTE I get like 0.01Mbps. Any ...
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3 votes
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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 ...
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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
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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?
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2 votes
1 answer
570 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 ...
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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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2 answers
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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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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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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 ...
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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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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 ...
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1 answer
222 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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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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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 ...
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2 votes
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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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734 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 ...
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4 votes
2 answers
295 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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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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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 ...
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2 answers
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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 ...
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3 votes
0 answers
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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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1 vote
1 answer
311 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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1 answer
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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 ...
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0 votes
2 answers
5k 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 ...
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1 vote
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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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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-...
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1 vote
1 answer
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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 ...
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7 votes
1 answer
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?
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2 votes
2 answers
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 ...
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1 vote
1 answer
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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 ...
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5 votes
1 answer
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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 ...
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2 votes
0 answers
714 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 ...
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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 ...
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1 vote
0 answers
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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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-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 ...
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2 votes
0 answers
56 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 ...
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0 votes
1 answer
65 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-...
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0 votes
1 answer
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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?
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3 votes
0 answers
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 ...
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0 votes
2 answers
890 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 ...
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3 votes
1 answer
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 ...
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1 vote
1 answer
263 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 ...
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4 votes
4 answers
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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 ...
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5 votes
6 answers
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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 ...
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0 votes
2 answers
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 ...
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0 votes
1 answer
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 ...
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0 votes
1 answer
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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.??
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16 votes
6 answers
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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 ...
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