hardware – 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 causing is general irregular behaviour, unforeseen reboots, reboot loops/hangs.

The “phone/cell” part of this unit is causing problems, and I have removed the SIM card, I have preformed a “delete cache” and “wipe data/factory reset” on the device.

This allows me to boot the device, go to airplane mode, and and by enabling this disable all networks. At this point, I am able to only enable WiFi networking, and the device is stable to use.

However, I would like to disable all Phone/Cell related software so I don’t have to enable airplane mode, and further stabilize the unit. Only WiFi is the only external network protocol which I like to use. (not GSM, not 3G/4G, not bluetooth)

So my question is: how do I disable all Phone/Cell functionality ?

How to keep my whatsapp on the new phone in a new country?

If I have WhatsApp number from abroad where I lived before, and I have a new phone in the new local place, is it possible to pass my WhatsApp number from the old one to the new without verification? (I’m not in the previous country where I lived but I want to keep using this number in use also in the current country with the new phone. Currently, I use it with my old phone because I don’t know how to transfer it the new phone without deleting it)

Turning on an Android phone with broken power and volume buttons

I have a Oneplus Two phone which fell down in just the right (or wrong..) way a couple of years ago and the volume and power buttons were smashed. I managed to use it for a while just without letting run out of battery but eventually moved on to another phone. Now I’m trying to see if I can somehow revive it or if I should sell it for parts. I remember I did install some app (likely Gravity Screen) that would supposedly turn the phone on when moved, but it doesn’t seem to do anything. The phone is otherwise charging just fine, I just can’t turn it back on.

Zoom meeting phone camera issues

I am trying to give lectures using Android phones back camera. The camera quality on zoom is low. Is there any advanced camera settings on zoom such as locking focus,exposure? tia

cellphones – Do I need to register my phone in Turkey if I’m using a UK SIM card?

In Turkey, people are required to register their mobile devices they brought from abroad. If a new device is not registered within 120 days, its IMEI number is blocked (official source in Turkish).

I’m a Turkish citizen living in the UK and occasionally travelling to Turkey. The official source assumes that short-stay visitors never come back after 120 days.

Do I need to register my phone even if I’m using a UK SIM card?

phone number in twitter – Web Applications Stack Exchange

I try to add my number to my account in twitter but I can’t because it say it use in other account but actually I buy thins number recently and i didn’t add it for any account so maybe the old owner add it for an account.
so how can I delete my number from unknown account?
I try this steps but it doesn’t work cause they actually close this page:

Navigate to twitter.com on a computer. This link only works if you’re logged out of Twitter.
Click on the Activate your account link located on the home page as shown below.
Enter your phone number when directed, along with the country code.
If your phone number is linked to a Twitter account, we’ll send your phone a text message containing a verification code. Use this code to confirm that the mobile number belongs to you.
On the following page, Twitter will ask you to complete your Twitter profile. Your username will already be filled in. That username belongs to the same account your phone is tied to.

also I send stop to 40404 but it doesn’t work

please help me

Photos in DCIM folder visible on phone, not visible via USB

I use a RedMi 3S (Android 6.0.1), non-rooted and fully updated.

I have a large number of photographs in my DCIM/Camera folder (in my “Internal Storage”). They’re visible via the Gallery app, File Manager, and even visible and accessible via an SFTP server that I set up on the phone.

However, if I connect the phone to a PC with a USB cable, and choose either PTP or MTP (Files or Photos respectively) – I don’t see these photos. I do see the DCIM/ folder, and one of the other subfolders there (named Screenshot) but DCIM/Camera is suspiciously missing.

Why is this happening and how can I transfer my photos over USB?


  • Unlike the highly related question, the issue here is not the out-of-date media manager database; I just performed a “rescan”, and it didn’t change anything.

adb – Dropped phone – display and possibly other parts broken – how to mirror?

I unfortunately dropped my Samsung Galaxy S7 today and it seems that the screen and possibly other parts are broken now. Since dropping it the screen has been completely black.

I’m trying to figure out what exactly is broken and if there is a chance to access data on the phone if I can mirror the screen on a computer.

Right after dropping the phone some of the buttons still lit up when I pressed them. When I tried connecting the phone to a PC or Mac via USB however, it wasn’t recognised and using adb devices I got an empty list of devices back. The phone has developer mode enabled and should have USB debugging turned on.

Tools like scrcpy or Samsung SideSync don’t recognise the phone either. A few hours have passed since and I had the phone charging but now the buttons don’t light up anymore. If it’s simply turned off how could I turn it on and would it be recognised by ADB etc if it reached the unlock screen? (It’s locked using a numerical PIN)

If more than just the screen was damaged, how would I confirm/diagnose this?

audio – All sound except phone calls not working on android phone

I have a Huawei p smart 2019 running the normal android os, and none of the apps make any noise (including zoom Facebook messenger WhatsApp YouTube etc) so they are effectively useless.

However when I get a call on the phone I can hear the other person and talk fine – so I think this is software rather than hardware.

Could anyone help?

miui – In Phone call, Microphone goes mute when opening any game. (Tried denying permissions, still facing)

Using Poco F1 (miui global 11.0.8). I abruptly go into mute when I boot up any games while in a normal phone call. This doesn’t happen in other apps. As I said, I tried denying microphone permissions for the game (Phone permission wasn’t required in there). Experienced this issue in Call of Duty mobile, Head Ball 2, etc., Is Game Turbo has anything to do with this issue? I can still hear them while gaming, whereas I’m muted until I exit the app (cries in embarrassment). I’d appreciate any help.