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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38 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 ...
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33 views

Text from unknown phone number about Capquest account [closed]

Over the past month I have been receiving texts every week/two weeks, each time from a different 07 number. These various texts each read the same message: Dear Hussan - a reduced settlement is ...
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1answer
9k 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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94 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 ...
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2answers
343 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 ...
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1answer
345 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 ...
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1answer
79 views

Is there a thing as a small bag which BOTH blocks signals AND sound for securing a mobile phone on the go? [closed]

I've been hunting for this for a long time. I've been able to find "Faraday" bags that (allegedly) block signals to/from the surveillance unit (phone), but they never mention anything about ...
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1answer
245 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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2answers
103 views

Is it normal/safe/justifiable that a bank asks me for my full login details (account id and PIN) when calling via mobile phone?

I am calling my bank via mobile phone (in Germany) and the electronic voice asks me to type in my account access id (via the number pad), and like-wise, type in my account PIN, all the numbers, not ...
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2k views

Any plans/research for SSL-like method in telephony?

I have recently read about attacks using Caller ID spoofing technology. Criminals used it to impersonate bank or police employees and asked to install malware or transfer money to a given account. A ...
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3answers
13k 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, ...
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1answer
117 views

WhatsApp message from own number + 1 [closed]

I got a WhatsApp message from a number which is exactly mine but the last digit is increased by one (5 instead of 4). It was just a "Hi" and and a photo of a random guy. I asked who it is ...
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3answers
3k views

Is it possible to track someone using their mobile number in the UK?

This is something I've wondered for a while - is it theoretically possible to track someone using their phone number in the UK? It's a classic Hollywood trope and I'm wondering just how much truth ...
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8answers
65k views

How hard is it to intercept SMS (two-factor authentication)?

A lot of two-factor authentication mechanisms use SMS to deliver single-use passphrase to the user. So how secure is it? Is it hard to intercept the SMS message containing the passphrase? Do mobile ...
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8answers
8k views

Why does my digital bank need my phone date and hour to be correct?

I'm not from Information Security or any IT related area. But I want to know if there is any security reason for my digital bank to demand my phone to be on "Automatic Date & Time"? For ...
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1answer
987 views

What are the privacy implications of the "Your Phone" app on Windows?

I'm trying to decide whether or not to use the Your Phone app on Windows, and not finding much information on it. It requires a Microsoft account, but I don't really see why that should be necessary ...
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0answers
79 views

My iPhone XS called someone today without my interaction

Yesterday, I was sitting at the computer and noticed that the phone is making the "calling" sound (that usual beep). I unlocked the phone and did not see any activity like I would call ...
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1answer
18k views

How to trace virtual phone number?

Suppose I received a call from internet with some virtual number, I called the same number back after few days but it didn't exist at the time or it was routed to some other user. Is there a way to ...
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2answers
113 views

What makes this cellphone (and the weird instructions) so privacy-friendly?

I stumbled upon this weird product in a webstore primarily selling Cannabis-related products (not the actual herbs): https://smoketower.com/nyheter/Anonym-3310-mobiltelefon I've manually translated ...
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78 views

Can I determine whether my phone probes base transmission station (BTS) without a SIM card?

This question is related to another inquiry on this site: Can Android phone running without SIM card be tracked (localized) by police? Accepted answer claims that: Without a SIM, your cell phone ...
5
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1answer
634 views

Is it possible to hack a phone just inputting dialer codes?

I'm currently in Germany, and today a woman asked if she could borrow my phone on the street, as she needed to make an urgent call. The thing is that I lended her my phone and, while I was making sure ...
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4answers
379 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 ...
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16 views

Can IMSI catcher locates you? [duplicate]

Are IMSI catchers able to locate your position and update in real time as you are moving? Also, can it detect the height of your location? (Like knowing which floor you are on?)
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121 views

How can I test if/how STIR/SHAKEN is working on my incoming calls? Both for detecting spoofed caller ID AND [bad sources]

How can I test if/how STIR/SHAKEN is working on my incoming calls? Both for detecting spoofed caller ID AND calls from disreputable (NON-'A' attestation) service providers/carriers/sources. I'm ...
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1answer
111 views

Can a SIM card lock be circumvented?

If so, how would one go about that, and realistically, how long would it take? Is there something we can do proactively to make this more difficult? This seems more relevant than ever since we would ...
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2answers
187 views

Does replacing the SIM card mitigate any threats after a serious data breach?

I recently heard that a telephone company (a mobile network operator) was hacked and lots of data was stolen, maybe affecting up to a million customers. It sounds like the leaked data is already ...
34
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3answers
3k views

Security implications of rooting Android

My Android smart phone has fancy features that I can get only if I root it, e.g., free-wifi tethering or Cisco VPN (with group name/password). However, the procedure to root my phone makes me ...
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2answers
521 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 ...
5
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1answer
889 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 ...
17
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3answers
3k views

Real life examples of malware propagated by SIM cards?

The laptops in use at my company have SIM card slots, which are actually used by some of our users. I am threat modeling our devices, so I was wondering if there are any realistic exploits that can be ...
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1answer
21k views

Getting called from hidden caller ID, what are the dangers if I answer?

My girlfriend has been getting calls on her iPhone from a hidden caller ID for several days in a row now. She has not answered any of them because we figured it can't be anything good if it's hidden. ...
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2answers
1k views

Does factory resetting a phone erase spyware?

I thought that there was spyware on my phone so I did a factory reset. Would the spyware be gone or it will still exist even after a factory reset?
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50 views

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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95 views

Did fraudsters access my SMS verification code?

A very strange sequence of events resulted in some unknown person gaining access to my online banking (with CIBC). I've since recovered my account, but I am very eager to understand what happened: I ...
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3answers
633 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 authorization (in case of 2 step auth) or for controlling the account (password reset,...
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64 views

Retrieving a No Caller ID phone number? [closed]

I got a call from an unknown number, more specifically, a no caller ID number. I’m not the guy who gets a lot of calls from a no caller ID phone number, and usually, when I got one is typically the ...
5
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1answer
499 views

Do SS7-based attacks affect landlines?

I am aware of the risks of SS7 for mobile users. Attackers can get location information, send spoofed texts, cause DoS and intercept phone calls/texts. Do those risks still apply for landlines? There ...
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6answers
30k 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 ...
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42 views

Is it reasonable to type a bank password in a phone call to the bank? [duplicate]

Recently my friend called their bank (via a normal phone call) to perform an operation with her account and she had to type her password during the call. Everything worked fine, the operation was done ...
3
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1answer
157 views

What is the risk of having an old, Internet capable phone not used for Interned compromised? (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 ...
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1answer
6k views

Should the MEID, PESN, IMEI1 and IMEI2 numbers be kept secret?

On my Huawei PLK-AL10, when I type *#06# in the dialer, a window named MEID_IMEI would pop up and display some random strings. Note that someone can get this information through the "Emergency call" ...
83
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3answers
14k 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 (...
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2answers
262 views

Danger of making calls after unknown random number called through

I recently received a call from a number I didn't know to my mobile, answered it anyway. I didn't say anything, when it is a number I don't know I let the other person speak first.. after a few ...
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4answers
852 views

What makes VoIP more vulnerable than a "normal" phone line?

NIST is deprecating VoIP SMS authentication. I don't understand the decision. What makes VoIP any more vulnerable than a traditional phone line? From the consumer side, I don't even know how to tell ...
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3answers
138 views

Calling from mobile phone without using the cellular network

This has been in the news: https://www.wired.com/story/fcc-fines-wireless-companies-selling-users-location-data/ Is there a way to make calls without using cell towers? Also in this context: is it ...
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1answer
130 views

Is phone number verifications with SMS magic HTTP links less secure than OTP?

I want to verify phone number ownership with specially crafted and encrypted payload within an HTTP hyperlink callback through SMS as opposed to sending an SMS OTP code and writing it back in server ...
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1answer
9k 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 ...
30
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6answers
6k views

Is revealing the phone number during OTP verification process considered a vulnerability?

One of the common way of implementing 2FA is using phone number Text message or Call with OTP. As I can see, usually web services show something like: OTP was sent to the number +*********34 Is it ...
4
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2answers
596 views

Offline phone security

How secure is an offline android phone? Some background. I want to use an app called Bither on android, which allows me to create a cold wallet on 1 phone and a hot wallet on another phone. Cold ...
4
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1answer
192 views

How does a company check the password received from your phone keypad during a call? [duplicate]

I had to call customer service recently regarding my 401(k) and robo call in the beginning asked me to enter my social security number using the keypad followed by a # and then asked for my account ...

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