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Questions tagged [phone]

A telephone, or phone, is a telecommunications device that permits two or more users to conduct a conversation when they are not in the same vicinity of each other to be heard directly.

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3 votes
1 answer
426 views

What is the risk of compromise of an old, Internet-capable phone not used for browsing? (not smartphone)

I'm talking about a class of old mobile phones that are not smartphones but are still (theoretically) Internet-capable, at least via 3G. Examples of such phones include Series 40 Nokia phones or the ...
15 votes
3 answers
922 views

Canadian police mentioned a new line-trapping technique, but what is that?

The police in Canada are saying that there is a new technique ("line-trapping") where the scammers told a lady to call the police to confirm some fraudulent details, but when she hung up and called ...
2 votes
1 answer
479 views

Apple Mail versus GMail app content security

I am trying to determine if there is a benefit to using the GMail app over the built in iOS one when it comes to security. I know that both store data locally on the phone, but the question is whether ...
0 votes
2 answers
605 views

How are USSD messages used and who could send them?

Some illegal ads started showing up on my Android phone as message boxes recently. They are said to be "USSD messages" in an app recording notifications (com.evanhe.nhfree). There is a Wikipedia ...
6 votes
1 answer
636 views

GSM - Implementing Cipher Mode Command on YateBTS

I've been studying on Yate & YateBTS source code for a while, and I was wondering why there is no ciphering mode implementation in the source!? I use the combination of BladeRF x40 FPGA and ...
5 votes
1 answer
2k views

Can WhatsApp, Signal or Telegram be hacked through a SIM SWAP attack?

In Cuba the telecoms/ISP monopoly, Etecsa, works with the political police to spy on dissidents, journalists and others. A common attack in Cuba is therefore SIM Swapping which is easy for them. It is ...
9 votes
0 answers
1k views

How could I block or at least detect the use of ultrasonic side channels or Google Nearby Messages API on my smartphone?

My question is about the use of ultrasonic messages that are part of the modern advertising ecosystem and are also used by the Google Nearby Messages API. When it comes to advertising, the type of ...
7 votes
0 answers
5k views

Are there any security benefits to enabling the PIN on an eSIM?

For physical SIMs, I'm aware of a number of security benefits to enabling the SIM PIN, because for an attacker with access to a lost or stolen SIM, a PIN prevents transferring the SIM to a different ...
1 vote
0 answers
106 views

Am I being tracked or something? [closed]

A guy asked to borrow my phone to make a call. Instead of giving him my phone, I asked what the number was, put it on speaker and made the call. Someone answered but barely talked, she sounded maybe ...
1 vote
0 answers
80 views

Tracking Apps Spyware [closed]

Looking on how to best advise someone who continues to have phone hacking issues. She changes devices, carriers nothing stops it. Local law enforcement have been no help. Very detailed personnel ...
0 votes
1 answer
117 views

Can an earpiece transfer virus from one phone to another? [duplicate]

I gave a friend my earpiece and her phone had audio issues prior to that, I took it back and connected it to my phone and ever since I did, my audio stopped working. Now if I try to do anything that ...
3 votes
3 answers
8k views

I connected to a suspicious public wifi using my phone. Is it possible that my phone was hacked?

I recently was outside looking for public wifi because my android mobile internet wasn't very good. I went past a garage that had free wifi apparently, so I went up there and connected to their wifi. ...
1 vote
0 answers
99 views

Why does Amazon make you enter specified digits upon calling their customer service switchboard?

If one calls the Amazon customer services number, a robotic voice asks one to enter three numbers. Along the lines of “to be connected to a customer service associate, please press [XYZ]” (where [xyz] ...
1 vote
3 answers
1k views

Effective ways to hash phone numbers?

Suppose a company wants to implement 2FA for it's users using phone number OTP system, but does not really want to store their phone numbers as it could get breached and phone numbers are considered ...
2 votes
2 answers
407 views

Does Signal store mobile phone numbers server-side in plain text?

Does Signal (the company) keep or ever have mobile phone numbers in plaintext (on any form of server-side storage)? I searched the web and couldn't find an official statement/documentation/answer/code/...
1 vote
2 answers
4k views

Do car Bluetooth FM transmitters allow others to eavesdrop on the hands-free phone calls that I make?

My car's entertainment system is only able to play audio CDs and receive AM/FM radio. I am thinking of getting a Bluetooth FM transmitter so that I could use my car's speakers to play my smartphone's ...
4 votes
4 answers
1k views

How advisable is to give my phone number as part of dating/ casually socializing?

TLDR: What are the risks, consequences, of giving my phone number to civilian people I meet while socializing/dating or in casual life? If a bad actor gets my phone number, what attacks to expect, and ...
1 vote
0 answers
47 views

How to deal with unused smart phones safely [duplicate]

I have several old smart mobile phones that are not going to be used anymore, most of them have run out of battery and I cant remember whether I have any sensitive data on them. How should I deal with ...
0 votes
0 answers
29 views

Is it possible to trace a virtual number back to its service provider? [duplicate]

If a virtual number is only used to send and recieve messages, is it possible for somebody who know the number to trace it back to its service provider and somehow seize the number? (perhaps buying ...
2 votes
3 answers
35k views

Can someone who only knows your phone number and first name perform identity theft?

I was wondering, since people give their phone numbers to strangers, for whatever reason, could it be possible if that person, who has only your phone number and maybe a first name to somehow do some ...
1 vote
0 answers
104 views

Is Android SOS being used as privilege escalation or settings bypass?

I have been getting random SOS countdowns triggered on my phone. Every time this happens, a pop-up appears telling me that unknown numbers have been temporarily unblocked. The most recent instance was ...
3 votes
0 answers
253 views

Can a bad guy ever get access to my gmail account using ONLY the 2fa app or ONLY the recovery phone (plus username)?

Let's say X is a malicious person. Let's say I have a gmail account with a recovery phone and with 2fa enabled. Let's say X knows the username but not the password. X doesn't have any other ...
2 votes
0 answers
155 views

Is a mobile phone number in itself an information that can be utilized by hackers etc? [duplicate]

I recently installed Tinder, and I saw that the app warns about sharing your phone number to avoid being hacked. I also noticed certain obviously fake profiles pressing for getting a phone number or ...
1 vote
2 answers
210 views

Prevent device from seeing WiFi networks for geolocation

This is something I was wondering while trying to improve my privacy. Mobile devices tend to use geolocation based on WiFi networks they find available (thanks to evil Google...). One could use ...
0 votes
1 answer
340 views

Can my infected phone’s hotspot infect my outdated computer?

Knowing that anything is possible for the many ways a hacker can break into a system, is it also possible that if I have an infected phone acting as a hotspot, my outdated computer could get infected ...
3 votes
3 answers
734 views

If I smash this phone into a million pieces is it secure?

This phone that I am using has some very sensitive info on it. I am wondering if it will be secure if I take a hammer and smash it into many pieces, and if I take the pieces and throw them out at ...
0 votes
2 answers
526 views

Can dumb-phones be turned into bugs?

Is it possible for an advanced attacker to use a dumb-phone (such as, say, Nokia 105) to spy on its owner through the microphone?
1 vote
1 answer
104 views

Is it worldwide standard that incoming phone call numbers can be faked?

I am living in Germany and here attackers can fake the incoming phone number when you get a phone call. For example you can get a call from 110 (police telephone number) although it is not the police ...
1 vote
0 answers
3k views

How does phone tracking by police work?

For android phones in India can police get a phone's IMEI number just by using that phone's number? also suppose if a phone was moving around within few miles radius for few days and it was turned ...
16 votes
7 answers
39k views

How should I safely display my phone number on my website?

If I display my email address on my website, I would probably receive a lot of spam, so I can set up a contact form instead. If I want to display my phone number, how can I prevent unwanted phone ...
32 votes
4 answers
1k views

Android security without updates

I have an android phone which, like many others, has quickly become unsupported and is not receiving any updates. At the same time there are publicly available exploits for privilege-escalation ...
6 votes
2 answers
13k 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 ...
0 votes
1 answer
172 views

Older Phone Models Less Secure?

Are older phone models inherently less secure than newer ones assuming you're still able to run the latest software? I am pecifically curious about older models of iPhones (e.g. ~2015 ish)
1 vote
3 answers
697 views

Is using my phone number as a pin for a phone a security risk?

I just did a factory reset on my smartphone to see if it might fix issues with battery life. I configured a phone number as the lock screen code so I have a code that's both long and easy to remember. ...
4 votes
1 answer
722 views

Why can't spoofed caller ID's be identified?

There are several posts here about how easy it is to spoof caller ID and that there is no way to detect it. I did find one post suggesting the calls to 1-800 numbers could not be spoofed. being ...
86 votes
3 answers
15k views

Can phone apps read my clipboard?

Via Hacker News, I came across a Tweet implying that Facebook's iOS app routinely reads and transmits all content from the user's pasteboard. Leaving aside whether Facebook's app genuinely does this (...
1 vote
0 answers
295 views

What equipment would an attacker need to infect a SIM card?

I'm aware that SIM cards can store malware according to this question but what equipment would be needed to do such an attack? For example, would you need a Computer and a SIM card reader or could it ...
0 votes
1 answer
195 views

How is the stream cipher key shared on GSM?

I read that phones encrypt communication (GSM as implemented in 2G,3G..) - particularly voice as SMS are unencrypted - using a stream cipher. Symmetric Stream ciphers use the flip-flop machinery to ...
2 votes
0 answers
123 views

Receiving phishing text messages

I get a phishing messages on SMS every now and then. I'm not sure if it's from anyone that knows me. What information can I get about the sender of the SMS?
0 votes
0 answers
158 views

Is it possible to inject code using physical memory access to jailbreak phones?

Is it possible to inject code into RAM using physical access? For example desolder the RAM chips, solder something between the original RAM chip and the phone motherboard, and use that to directly ...
3 votes
1 answer
2k 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 ...
0 votes
0 answers
53 views

Do you need physical access to hack a BT land line before an outgoing call is made (dialing tone)

Do you need physical access to hack a BT land line before an outgoing call is made (dialing tone)? I understand if you have physical access you could just put something in another phone socket. But, I ...
1 vote
2 answers
714 views

Is the "trusted phone number" inside your Apple ID a security flaw?

Imagine your iPhone gets stolen or seized. Inside this iPhone is your SIM-Card. That SIM-Card is your only SIM-Card and it is enlisted as "trusted phone number" in your Apple Account. The ...
6 votes
2 answers
18k views

Is it possible to un-spoof a spoofed caller ID?

I know that Trapcall allows mobile telephone users to forward their calls to a toll free number, which then forwards them back to the user's telephone, allowing them to see the caller ID. However, ...
0 votes
1 answer
567 views

What is the impact of someone accidentally getting my IMEI number from my Android phone? [duplicate]

I have a concern regarding how risky it is if someone knows or has the copy of my 2 IMEI numbers. As we all know, on Android phones, the IMEI are at the back cover of the phone like a sticker. So, my ...
2 votes
1 answer
190 views

Is there any truth to the (to me) bizarre idea that you can "track" a phone call better depending on how long it goes on? [duplicate]

I have heard many prank calls from ~2004-2007. In many of them, completely different people all mention the same thing about them "tracking the pranker", clearly in an attempt to scare the ...
0 votes
0 answers
218 views

How can you spoof you caller id but not using a voip (your carrier instead)?

My research: I found this security stackexchange post but it didn't answer my question. I know that you can do similar things using astresik with voip provider. I came up on o blog that explain that ...
16 votes
3 answers
1k views

Should 2-factor authentication using SMS be deprecated?

Google, Facebook and most of the important websites (banks, payment sites, etc...) use SMS as the major method for 2FA or for controlling the account (password reset, etc..). However, GSM was proven ...
0 votes
0 answers
119 views

Is there some way to "fully delete" received and sent SMS messages (and any other "deleted" data") on my cellphone?

I have a cheap cellphone bought about ten years ago. It has a physical SIM card. I have in-phone "deleted" all sent and received messages, but very strongly suspect that these are still ...
2 votes
1 answer
14k views

What happens if incorrect SIM card PUK entered 10 times?

I know that if incorrect SIM card PIN is entered three times, it is erased, so there is no longer any valid PIN, but user can set up new PIN with PUK. But when incorrect PUK is entered 10 times, it is ...

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