Questions tagged [smartphone]

A smartphone is a mobile device which combines many of the basic features of personal computing such as email, media playback and web browsing, with the traditional features of a telephone.

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Did I have USB debugging on or off? [migrated]

my phone got stolen a month ago and I Don't know if I had usb debugging on or off(I had enabled developer options in the past and messed around with it a little bit that's why I'm not sure) but I ...
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3answers
133 views

Reccomended way to securely erase SSD storage of a smartphone? [duplicate]

As far as what I understand there are different approaches and I have a few doubts regarding each of them: On the one hand, it seems that factory reset does not securely erase itself data from SSD ...
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28 views

Smart Tablet Device Vulnerabilities

My son and I have a cybersecurity concern. Somebody somehow compromised his tablet, accessed his files, and emailed them to him from something like guerrilla mail but we cannot figure out how. Our ...
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2answers
78 views

Are there any risks involved with plugging smartphones into Windows 7-10 computer's USB ports?

When you plug a smartphone into a USB port on a Windows 7-10 computer, often a small message box pops up on the Windows device indicating that drivers are being installed. This happens automatically ...
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Can android spyware access photos of my phone

I have installed some mod apks on my phone few days ago and i am feared that if they contain any type of spyware then can they access photos of my phone?
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2answers
103 views

Do android spyware apps comes attached with games or mod apk files?

I have installed several mod apps of Netflix, amazon prime, games apk from google in android v10. Can spyware be installed through these apk. these apps have not taken much permissions from me they ...
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Should I occasionally replace my SIM card for security reasons?

To be able to use mobile data (e.g. 4G/ LTE) and mobile telephony (e.g. VoLTE) services on my smartphone, I need to put a SIM card into my smartphone (I know embedded-SIM/ eSIM exists but let's ignore ...
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1answer
2k views

Secure way to hold private keys in the Android app

What would be the most appropriate way to store private keys for barcode signing in the Android app? Probably most experts here would say - just don't do it, cause it's insecure... But I would like to ...
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2answers
137 views

Can an android phone that is flashed to a trusted safe rom still be malicious?

I'm in the market for a new phone. The cheapest ones with decent specs are from China. Unfortunately I've read articles of phones sending data back to China for spying purposes. The phone I am looking ...
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Trying to defend against Cell site simulators

I take a phone, insert a SIM Card in it, then connect it to the internet. Then I switch on Wi-Fi Hotspot on it. Then I connect a second phone to the Hotspot of the first phone, and use this first ...
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1answer
172 views

'Removing' telecom provider from my phone

Baseband Processors have very weak overall security(closed-source firmware, no audits etc.) It also gives the telecom operator very high privileges on a mobile device. So, now I use 2 phones. First ...
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458 views

Can someone impersonate you on WhatsApp?

Well I'm not a developer so I'm here to resolve a specific question. I have been investigating this subject for a while now and I need and opinion from experts or developers which really understand ...
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1answer
695 views

Security and privacy concerns about “IMEI check” websites

I know there are few questions about the risk of IMEI with various answers from rare risk to none. But my question is regarding the kind of websites that provide IMEI check services for free with some ...
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2answers
179 views

Android phone's lockscreen PIN disappeared?

I own a ZTE Axon 7 (model 2017G) that I purchased secondhand from a reputable vendor in Germany ca. 3 years ago. The phone has been working well, and I updated the OS to Android 8.0. manually earlier ...
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1answer
72 views

2-weekly cell phone (android) browsing to columbus . shortest-route . com

Last month I resetted my cell phone, also immediately installed Malwarebytes and Avast. Every scan until now was/is safe. But I also have a virus scanner which is included in my ISP safety package (...
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1answer
79 views

Can your phone get hacked just through your phone number? [closed]

If someone has got your phone number can they hack into your phone using just the phone number? Perhaps by sending an SMS?
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800 views

Signal: contact people, or have people contact me, without revealing phone number?

Is it possible to use Signal without revealing my phone number to others? I'm personally using the Signal app on Android, but of course it applies to all versions, desktop and mobile. With Telegram ...
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1answer
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What additional privacy impact does using the COVIDsafe app have for people in Australia who are using their phones normally?

I've been trying to encourage some people I know to install and use the COVIDsafe app. Some people have raised privacy concerns as a reason to not install the app (there's other concerns, such as it ...
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1answer
72 views

how to protect smartphone data against theft?

i assume typical android has fully encrypted disk with a key stored in a header. header is encrypted using pin / pattern / fingerprint or not encrypted when there is no lock. is that correct? when ...
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10answers
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Does the saying “physical access = game over” apply to smartphones, too?

I was surprised to read in the responses to this popular question that it's considered nigh impossible to secure a computer system if intruders have physical access. Does this apply to smartphones ...
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44 views

How can you spoof your caller ID? [duplicate]

How can I spoof my caller ID to make it look like someone else is calling for pen testing purposes. Note: I tagged Python because I am trying to make it with Python.
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1answer
50 views

Why computers accept biometrics as first authentication but not phones

After powering on laptops and desktop computers, you are allowed to use biometrics for login. But, as far as I know, biometrics are not allowed for unlocking phones after powering them on. You are ...
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2answers
92 views

How can I make sure my master password is as strong as possible?

How can I make sure my master password is as strong as possible? The password manager I'm using is Bit Warden. Is creating a passphrase a good idea? I know it's good to include characters, numbers ...
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1answer
65 views

Can cellphone packets be read by someone who only has your phone number?

I got an IM from a person I recently got acquainted with this year. In the text message, he asked me if I knew the name of the website you download free ebooks from (libgen.is) I found it really weird ...
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423 views

Android 10 downloaded suspicious files without my permission

This is my first question on this forum so please let me know if I need to clarify anything. My Android 10 Pixel 2 just downloaded 2 files without my permission today, both named something to the ...
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1answer
86 views

Are the locations text messages are sent from logged?

When you send a text message from a phone with a sim card, is there a log which records your location at the moment, or any other information? is it linked to the phone? to the sim card? to both?
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1k views

Is Android encryption secure? [duplicate]

As far as I know Android (Pie) is encrypted by default with some hardware-based password. But how secure is this encryption? I am not talking about password compromise, but if somebody gets my phone,...
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2answers
243 views

It's possible to make an account in mainstream social media without giving them my phone number or have a phone number that can identify you?

I'm learning about privacy and security and one of the tips everyone always talk about is compartmentalization, I'm trying to do this and get rid of my old profiles in social media (one of them have ...
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591 views

How could a mobile banking app be hacked?

My phone got stolen, and sent back to where it was stolen a day after. At the moment of stealing, the phone was locked. When I received it back, there was no money left in my bank account. The ...
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8answers
14k views

Can a stolen Android phone with USB debugging enabled have screen lock bypassed?

My Android (8.0) phone was pickpocketed from me yesterday. It was immediately turned off by the thief and when I tried to locate it using Find My Device it shows as offline. As a programmer and a ...
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242 views

How are calls or SMS used to exploit a smartphone?

How could a phone number be used as a means to gain access to a smartphone? I am reading claims that you could receive a call or SMS on your phone and an attacker can install their malware that way. ...
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2answers
105 views

Is there any way to alter a caller's voice just enough to make voice recognition impossible?

I did search and found this post: Is it possible to identify mobile phone user with voice recognition It does not answer my question, however. Is there any way to alter a person's voice just enough ...
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10answers
16k views

Blocking people from taking pictures of me with smartphone

This question might be better suited for Skeptics, but I guess that those who can really answer this might hang around here. In the second episode of the fourth season of the french spy series The ...
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3answers
515 views

Can an app access location services when I turn off location services?

An app I'm using requires me to grant it the permission to track my location, which I grant. But, if I manually toggle off the device's location service (for example in the settings or the drop down ...
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3answers
479 views

Is a cryptographically signing camera possible?

What kind of digital / cryptographic signing would make it possible to create a camera that cryptographically signs the photos it takes so that the images can be verified to have been taken with that ...
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11answers
17k views

How to securely dispose of a smartphone?

How to dispose of a smartphone (it's an iPhone 5) at home? I was reading through this SE site questions and found this one which hardly applies here. Besides, I'd want to do it so that: It's not ...
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3answers
467 views

Making transactions only, or almost only, by QR codes

I have a OnePlus 6 smartphone and I recently opened a bank account in a bank which seems to me very innovative in the context going payment card (debit/credit) free (using only application and/or cash)...
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143 views

Hacked iCloud account: how can I protect my iPhone security?

My iCloud account has been hacked. I access links sent by hackers that compromise my iCloud account. The hackers don't have physically access to my phone, the compromised links are sent by them ...
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1answer
7k views

How secure is full-disk encryption technology on LineageOS, or Android phones in general?

We're attempting to assess the information security on our mobile devices, and information seems rather varied on the question of encryption. Is the encryption technology employed by Android-based ...
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1answer
121 views

On a mobile, does using a password instead of a PIN make encryption stronger?

On a mobile, does using a password instead of a PIN make encryption stronger? What key does the phone use for its encryption? Would it use the PIN itself?
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1answer
217 views

How can I securily use a pre-owned smartphone?

Is there a feasible way to safely use a pre-owned smartphone? For a PC/Laptop I would simply shred the contents of the hard disk drive before creating new partitions. If feeling paranoid, I might ...
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1answer
654 views

How to secure a smartphone left for repair?

I need to leave my phone at a repair shop. The reparation is not trivial, so I can't expect them to do it under my eyes while I wait. But my phone is all my life. Like for most of us (I guess), I ...
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1answer
225 views

Hide an app on Android

Is there any way to completely block anyone or anything from detecting an app that is installed on any Android device? Not from physically looking through someone's device but from google or any ...
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1answer
69 views

Protecting Android debug bridge that is connected to the internet

I have an android device which acts as a brain for my home security that has access to cameras, heat sensors, motion sensors and some appliances. I have enabled android debug bridge on my android ...
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750 views

Can a smartphone's PIN or password be brute-forced in an offline attack?

I know of exhaustive offline dictionary and brute-force attacks against any given online account, but can the same method be applied against phones, either Android/iPhones? Or would any such attack be ...
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405 views

How does the “Control Frame Attack” bypass the MAC-Randomization on Smartphones?

In this Study regarding MAC-Randomization of different Smartphone Manufactures on page 15 the so called Control Frame Attack is described. I'm not sure whether I understand this correctly. Are they ...
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146 views

Why don't smartphone manufactures write the IMEI onto one time writable ROM so that it can't be tampered with? [closed]

The title says it all basically. Even now, why is tampering IMEI possible at all? Shouldn't manufactures be using one time writable memory to embed IMEI into phones? Why don't they?
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226 views

Do smartphones have built-in surveillance in certain countries?

I recently was in a third world country which is know as a police state with heavy cyber surveillance. I noticed that brand new smartphones came in a box that had a nice holographic seal showing the ...
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1answer
101 views

Lock gmail access from a smartphone

A friend has broken his smartphone. It has (at least) three security issues: It is not protected by any PIN, password or fingerprint It automaticaly access gmail (I'm not sure if he just rememberd ...
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1answer
1k views

Can a smartphone get hacked even when off? [duplicate]

I've read that there are multiple batteries inside a smartphone, so even when you turn it off it can still communicate with other devices. So my question is, could a smartphone get hacked even when ...