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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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21 views

Most accessible yet secure way to verify a user over the phone who has an account online

We have a service where people register online and log fairly sensitive records. They might want to phone up and ask for a status update on these records. At the time they are calling, they may not ...
3
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0answers
33 views

How do I report scam phone calls? [duplicate]

I get scam phone calls on a regular basis. The latest one was a computer-generated voice claiming to be a security expert from Microsoft and alleging "errors and fraudulent behavior" within my ...
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0answers
37 views

Can they trace the phone and find the location when it is switched off? [duplicate]

Is it possible to trace a telephone when it is switched off and without a battery and without a sim? And the SIM without being connected to the phone can be traced and located?
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19 views

Security risks in allowing IP phones to easily auto-configure

I wonder what are the main security risks in allowing Voice VLAN ports to provide QoS and most VoIP deployment configurations (via auto configuration) to the phones? Since it's best practice to ...
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3answers
261 views

What is future of SMS 2-step authentication?

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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0answers
44 views

How to delete data on a “keypad mobile” securely before selling it?

Nokia, Model: C1-01, Type: RM-607 How to delete data on a "keypad mobile" securely before selling it?
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3answers
129 views

When websites use SMS as part of a password reset scheme, why do they ask for the user's phone number?

I've noticed if you do a password reset on iCloud, for example, it prompts you for your phone number before sending the SMS. Since many people already know your phone number, or it may be listed ...
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1answer
119 views

Can a SIM-less smartphone be tracked only by IMEI?

If in the phone is no SIM card, connection to cell towers is at my own behest. But what about the opposite way, can the local base stations search for a specific phone through its IMEI? Question ...
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0answers
60 views

Can (the carrier of) a caller/callee see the position of the other ones mobile phone?

Someone came to me with the following request: He/She wants to drive somewhere without the employer knowing in his/her free time. If the employer will know about the drive, it will be bad for his/her ...
2
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1answer
52 views

How can Huawei (or any other telecom vendor) provide verifiable security assurance?

IMHO, It is in Huawei's (and all other equipment manufacturer's) best interest to preclude \ prevent any party from remotely breaching security. All government actors monitor communications by ...
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2answers
128 views

What are the security implications of losing a paper calendar?

Assuming I have a paper calendar (organizer) with the following information on it: dates/locations where I have been and where I'm planning to go phone numbers and e-mail addresses of a few people my ...
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2answers
150 views

How to securely destroy old cellphone, to avoid personal data recuperation?

While cleaning I've found an old cellphone. This phone does not turn on, and I'm not sure if contains personal data. I would like to throw away this phone, but I'm concerted if this data can be ...
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3answers
72 views

Are DTMF tones decoded by the DTMF producer?

If I generate a DTMF(dual tone multi frequency) tone on phone A, clearly the tone gets decoded by the other phones (phone B, C...) on the call. Does the DTMF tone also get decoded by phone A? How is ...
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3answers
239 views

Is a second, “old” (dumb) phone dedicated just to receiving bank tokens as safe as “modern” (smart) phone?

Are old phones safer / safe / as safe as modern smartphones when it comes to auth-tokens / confirmations tokens? Is SMS encrypted?
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1answer
102 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
385 views

How secure is a land line phone call?

What are the risks of communicating sensitive information using a land line? Once my voice gets digitized does the carrier use encryption during transport? We have all heard about rogue cell towers (...
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1answer
86 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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3answers
260 views

Can we wipe an Android phone completely using Encryption and Factory Wipe? (Samsung Galaxy S7 to be exact)

Can we wipe an Android phone completely using Encryption and Factory Wipe? (Samsung Galaxy S7 to be exact) I have a Samsung Galaxy S7. I believe cell phones use flash storage (like SSD) and its not ...
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1answer
260 views

Mobile call encryption [duplicate]

Is the signals of a mobile phone-call encrypted between the phone and the mobile-tower or only between the towers? And is it possible for a non-authority individual to eavesdrop on your conversation ...
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4answers
3k views

How should I verify a caller is from the bank or company they claim? [duplicate]

I often get telephone calls from my personal bank, mortgage provider or utility companies. In most cases they start by asking me to verify my identity through the usual name/address/date of birth or ...
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1answer
538 views

How To detect Fake mobile number for SMS verification [closed]

I am facing some issues regarding SMS verification in my website. Suddenly, some transactions are happening using the fake numbers like https://www.receive-sms-online.info How to detect the number is ...
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2answers
61 views

At What Point Does A Device Correspond/Link to its Owner?

I am aware that governments, organizations and hackers can do a plethora of things to your device (i.e. track your location, tap calls, etc.), but I can only assume that they can only do these things ...
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1answer
76 views

Can Apple Devices Give Away Location to Hackers?

In a hypothetical scenario, I am travelling with my iPhone to, let's say, New Zealand. I stop at some random hotel and simply stay there doing nothing but staring at a wall for days with no ...
2
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1answer
124 views

Phone Number Appears to Have Been Temporarily Hijacked

What Happened: At 8:40am Telegram sends me a login code via the Telegram desktop app. At 8:44am Telegram informs me that someone has logged into my account via ip address #1 (appears to be PIA vpn) I ...
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0answers
36 views

VoIP/SIP Secured Real Time Protocol (SRTP): Which key length is appropriate nowadays?

Many critics say that current key lengths for SRTP-encryption in popular phone apps like Linphone or CSipSimple are not sufficient anymore. What should be a recommended key length nowadays?
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2answers
139 views

Can my company see the contents on my iPhone if I used my work email on it?

I'm temporarily employed at a company and I needed to send a quick email to one of my coworkers yesterday explaining that I was going to be late for my shift. I couldn't reach them by phone and didn’...
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1answer
142 views

Can malware be installed on a mobile phone when the user opens an sms?

Is it possible for an adversary send malware over messages? I mean, when the victim clicks on the message sent by the attacker, a malware should be installed into his phone (in background). The hacker ...
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0answers
422 views

How secure are IMEI numbers?

I recently had my phone stolen (Galaxy S8) and have done the following: Wiped it remotely Reported the theft to network operator, who have allegedly blocked the EMEI I have tried searching for ...
3
votes
2answers
133 views

Possibility of business calls/leads being professionally stolen? [closed]

Is it possible our VoIP calls being redirected from our intended phone number to another phone number unknown to us? Our VoIP number is currently forwarded to mobile phones and computer phones. ...
2
votes
1answer
101 views

Privacy concern: Services requiring a phone number for signing up

Whenever a service requires an e-mail address for creating an account, I feel mildly uncomfortable, but I can easily eliminate my privacy concerns by setting up a new e-mail address that forwards mail ...
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3answers
270 views

Tracking phone in country when SIM is not supported [closed]

Can the police track my cell phone if I left the country and went to another one and the SIM card is not supported by the country I went to?
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3answers
395 views

If you phone is seized, can you erase sim or stop them from cloning?

If your phone (for example, an iPhone) gets seized by the police, do they have sufficient technology to copy sim card (or any data) even if you cancel you provider and put phone in lost mode? If so, ...
2
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1answer
102 views

Dangers of giving away Cell phone details

I got a spam call saying saying they are upgrading my plan but needed some details. Obviously I knew what it was and gave them fake info. My question is given the information they asked for what are ...
2
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1answer
152 views

Are there any known exploits targeting Google Authenticator on Android phones?

My Android 7.0 phone is somewhat lagging behind on the security updates, a situation I cannot change unfortunately (unless I would root the phone). I am not too concerned about this in general since ...
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0answers
179 views

How do 'fake cell towers' work? And besides bugging and tracking what are they used for?

A friend of mine used an app that detects suspicious cell towers and has been getting warnings today. He is worried about the possibility that someone may be specifically targeting him, which leads me ...
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2answers
2k views

Is Paypal's 2FA Security really this bad? [closed]

I'm by now means an expert in this field, or even well versed, but if it's possible to do this, I can't comprehend how Paypal allows it. Say you have 2 factor authentication on, with your phone setup ...
3
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3answers
658 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. ...
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5answers
468 views

What is the best protocol for an organisation to make phone calls to clients, where the client is required to verify their identity?

I've experienced a couple of times, an organisation has called me, but they require me verify who I am with security questions. Most recently, this was my credit card company who left a voice ...
4
votes
4answers
463 views

Phone number setup for security

Several Q&As here highlight the danger of phone hacking. For example, this. In a nutshell, the solution is to NOT give your phone number, except to your bank or government. Unfortunately, that ...
3
votes
1answer
191 views

How can I know that whoever called me is my cellphone service provider?

I just refused to give my credentials to a phone call operator who called me. and I wonder whether I did the right thing. Background. My cellphone operator (call them Alpha) uses a simple ...
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2answers
333 views

How to set up security on my phone [duplicate]

I am using my friends Wi-Fi and I don't want anyone else using the same Wi-Fi to be able to see what I am doing on my phone. How do I put up some kind of security so that people in the same network ...
3
votes
4answers
189 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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1answer
118 views

Found recording of unkown phone call - did someone hack my Android phone? [closed]

I installed a phone recorder on my Android just to have memories of my mother's calls. Yesterday the memory was full, and in the call history I found an unknown number I know I never answered to. And ...
30
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4answers
6k views

How can a website verify that my phone number belongs to me?

I was signing into a Capital One credit card website that I hadn't used in a long time, and once I entered my user name and password, it requested my mobile phone number for additional verification. ...
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1answer
122 views

What phone would be most private and what aspects to consider? [closed]

I want to change my phone and I would not use it for anything than calling and messaging. I would be happy to have phone the most private friendly and secure against any type of information withdraw ...
10
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3answers
3k views

Can an infected phone infect other computers in a network?

Can an infected phone infect other computers in a network? For example do you need to worry about private phones in a company enviroment? Or is that already paranoid?
76
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2answers
8k 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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1answer
130 views

How does a phone call / SMS message verify my identity

More and more I've been seeing online services that want to verify my identity using an automated phone call or text message. The trouble is - they ask me to provide the phone number! It seems the ...
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1answer
226 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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3answers
2k views

Someone is making random calls spoofing my phone number. What to do?

For the past six months, I've experienced call-backs from foreign numbers (all within the EU) telling me that I had called them earlier. At first, I thought the calls are malicious. However, due to ...