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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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4answers
80 views

Could've previous owner installed tracking software on my phone, even if I changed the SIM card?

I recently bought a used mobile Android phone. Is there any way to install malware, tracking software etc. that is not on the SIM card, but on some other kind of memory disc?
6
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1answer
211 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 ...
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0answers
77 views

What is the method police use to recover deleted data from phone memory?

I am writing a story that involves a cellphone being recovered at a crime scene. The police go through it and find all the non-deleted files and continue until a they do something to obtain the data ...
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3answers
274 views

Is it safe to help a stranger login to gmail using my phone number?

I was assisting a man at the public library who was unable to login to his gmail account. He typed in his password and was prompted for a phone number, presumably so a code to be sent which would then ...
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0answers
72 views

How to prevent phone number being searched online? [closed]

Recently, read an article about phone number being used to hack into one's account. NYTIMES-Phone hacking What needs to be done to prevent my phone number being searched? (Return invalid hyperlinks ...
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1answer
91 views

Exchange sensitive information through public chat

Is there a way to exchange phone numbers/email addresses through public chats with a person without giving them or other communication information away to all the other people in the public chat? ...
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0answers
48 views

Someone is calling from my number, and its not me? [duplicate]

My number is being regularly spoofed by someone. Today, I got 100 + calls from people claiming I called them. I answered some of the calls they are all locals from my province. I asked my provider ...
48
votes
2answers
9k views

“This used to be my phone number”

I added a new phone line and someone called claiming to be the previous owner of the phone number. He requested that I forward information a text message (He wanted me to forward 2 Factor ...
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0answers
35 views

Spoofing phone number [duplicate]

How it's possible spoofing an existing phone number? I have read something about ss7 exploitation, but i'm not sure is necessary. Can someone explain me some theoretical techniques?
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0answers
54 views

Access Android files without entering pass-code

I have a Samsung A5 from a friend. Her screen is totally broken (black) and she wants me to recover her files. The problem is that you need to enter the pass-code of the phone in order to be able to ...
0
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0answers
62 views

How to protect from being the spoofed number on caller ID?

The question How to protect from caller-id spoofing? focuses on how to protect oneself from incoming calls with spoofed caller ID information. This question is about how to protect oneself when ...
54
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7answers
11k views

How can caller ID be faked?

My late brother was contacted by someone on landline number operated by a carrier in Australia and which displayed on caller ID. I traced the number to a company and though they did call him on a ...
2
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1answer
204 views

Is this foreign call some kind of scam and what kind is it?

Every few days I get a call on my mobile phone from a number like 370 621 65748, which seems to be a Lithuanian number, but it only rings once and then disconnects. It happens enough to seem ...
1
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1answer
759 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 ...
1
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2answers
176 views

Samsung Galaxy S7- If I drain the battery so its dead and remove the simcard, can it's location be tracked down?

I got 2 questions regarding my Samsung Galaxy S7- Q1) If I drain the battery so its dead and remove the simcard, can it's location be tracked down? I'm asking about a dead battery vs removing the ...
3
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0answers
201 views

Can SS7 attacks intercept SMS sent to a Google Voice number?

Hackers are able to steal 2FA SMS messages by exploiting SS7. As far as my understanding goes, this means gaining access to the SS7 system and then broadcasting a message akin to "This number is ...
0
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1answer
88 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
894 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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0answers
281 views

Strange inbound MMS messages

We received some strange inbound MMS messages on our Twilio account today. Our account was not compromised, as there are no suspicious outbound messages sent from our number via Twilio. We first ...
1
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1answer
191 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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0answers
119 views

Can mobile service providers use my iPhone's microphone to listen even when I'm not on a call?

So is this technically possible? Basically can the service provider somehow hack into my phone and use the microphone to hear the surrounding of my phone if they somehow have a backdoor/malicious code ...
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0answers
28 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
38 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 ...
0
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0answers
75 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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0answers
24 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 ...
10
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3answers
344 views

What is future/alternative to 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
55 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?
3
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3answers
148 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 ...
1
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1answer
342 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 ...
2
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0answers
83 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
votes
1answer
84 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 ...
1
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2answers
130 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 ...
2
votes
2answers
263 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 ...
1
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3answers
178 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 ...
8
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3answers
314 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?
4
votes
1answer
201 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 ...
10
votes
1answer
578 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 (...
0
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1answer
133 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
2k 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 ...
0
votes
1answer
862 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 ...
29
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4answers
5k 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 ...
-3
votes
1answer
833 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 ...
1
vote
2answers
64 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 ...
2
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1answer
83 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
votes
1answer
142 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
50 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
213 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’...
0
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1answer
252 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 ...
6
votes
1answer
850 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 IMEI I have tried searching for ...
3
votes
2answers
139 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. ...