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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42 views

What information can be gained given only a phone number? [on hold]

What personal information can be obtained given only a phone number? What information is your phone number publicly (or privately, but with easy access) linked to? Here is the way I am looking at ...
0
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0answers
30 views

How to change MAC address on Windows Phone 8.1? [on hold]

I did't find any method to change MAC address for Windows Phone devices, unlike the Android devices, so I want to know if there is a way to change my Lumia 525 MAC address.
28
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3answers
6k views

Why do I need to hide my phone's IMEI

If it is a secret then why is it visible on the box, invoice and the back of the phone? If it is not a secret then why does it have to be blurred when it gets posted online?
4
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1answer
100 views

Why do phones send wifi probes?

They could just listen to beacons. Why do they probe for every network you've ever connected to? Do other wireless devices do this? Does Windows, Linux esp. Kali, do this?
7
votes
4answers
601 views

airgap a smartphone?

I'm looking to use my smartphone purely as a portable computer, with no network functionality in order to protect my privacy. Is removing the sim cards from it enough to airgap it or do I need to go ...
22
votes
2answers
4k views

A security concern I dicovered with simcard devices

Well, it all started when I wanted to take the sim card out of my tablet and I was about to shut it down so that I could take the simcard out. But then a thought raced through my mind, "What if I take ...
42
votes
5answers
6k views

Bring your own phone to a (new) job: Consequences?

I am starting a new job, and I have the choice to receive a phone from the company, or to bring my own. I am considering using my own phone, to avoid having an extra device, but I want to better ...
0
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3answers
73 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. ...
13
votes
3answers
289 views

How safe are data you dial to a call center?

Sometimes when you call an administrative service it tells you "Dial 1 to access such service. Dial 2 to access some other service. Otherwise, dial 3." No harm if somebody comes to learn I chose "2". ...
0
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1answer
104 views

Twitter phone verification while on Tor [closed]

Twitter locked me out of my account. I can log in but I can't do anything with it until I give them a phone number. I've had the account for years but they've decided now there's "suspicious ...
-5
votes
1answer
51 views

How to authenticate a user account from a website over the phone?

A support team is answering calls and providing well support. It would be conceivable for someone to impersonate or ask for something which should be authenticated first. Which are the best methods ...
2
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4answers
19k views

Can viruses transfer from phone to computer over the network?

I don't know if this is the right place to ask but I heard that adult websites (porn) had viruses. I used to look up porn on my iPhone (I won't anymore) and I understand that there aren't viruses for ...
0
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1answer
120 views

The spyware spooks use to hack mobiles [duplicate]

With regards to the report and video link below: How do I guard against this sort of snooping? Is it only possible if unwittingly install some kind of trojan? BBC Click Report: Surveillance ...
2
votes
1answer
93 views

Find out the identity of the person that called you

I once heard that if a number that you don't know called you, you can access a website (that I don't remember now) that will call the number and make a recording of what the person said and send it to ...
0
votes
1answer
91 views

Scam caller claimed to have elderly friend's “Windows unique identifier”

An elderly friend received a telephone call similar to this Information Security SE post and this one. The caller claimed that my friend's computer had a problem that needed to be fixed. My friend ...
3
votes
1answer
73 views

How secure is VOIP?

I was at a friend's house who uses VOIP on his own private WiFi for his phone calls. He made a call over VOIP (Voice Over Internet Protocol) that included the need to verbally state his credit card ...
19
votes
3answers
2k views

Could my bank's two-factor authentication be hacked?

When I attempt to log in to my bank, an SMS code is sent to my phone. I then type this nine-character code into the bank's Web site, to login to my account. Is this vulnerable to attack, without ...
62
votes
7answers
18k 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 ...
-5
votes
2answers
83 views

How do i make a phone number authetication system for my website? [closed]

I really need to prevent users from create multiple accounts. So I was thinking about making a phone number authentication system. Where when a user signs up, a 4 digit code is sent to their phone, ...
1
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2answers
110 views

Could one fit a root application in sim card

In the third Mr.Robot episode a character inserted a Micro-SD card in a smartphone in order to root it and gain information, so I thought maybe someone could fit a root-kit on a Sim-card. Would that ...
50
votes
11answers
18k views

If someone asks to borrow your phone to make a call, what could they do?

A stranger walks up to you on the street. They say they lost their phone and need to make a phone call (has happened to me twice, and maybe to you). What's the worst a phone call could do? Let's ...
1
vote
1answer
47 views

Does calling with wireless phone have enough security? [closed]

I'd like to know if calling with a wireless phone at home can be heard by neighbours and if it is safe.
14
votes
2answers
52k views

Is it possible to make a phone call appear to come from another phone, even to the network provider?

Quick Question Is it possible that I could call a mobile number, but have the call forwarded through another number active on a different phone that someone else has? I have had unlimited access to ...
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1answer
64 views

Is there any way track a Andriod phone using IMEI Number [closed]

I have lost my phone and I have a IMEI number of it. However, the guy removed my SIM card. Is there any way to track who is using my phone?
1
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0answers
26 views

Migration from TDM to All IP: any security issues?

My phone operator is slowly abandoning TDM (Time Division Multiplexing) to replace it with IP connections. What are the security risked related to this change? will all the phone line be like in a big ...
2
votes
1answer
3k views

Is there any way to detect caller ID spoofing?

To be specific the main problem is that I want to detect if the caller ID of the incoming cal I get is real or spoofed? Most VoIP servers now allow their clients to use any caller ID they want. Also, ...
1
vote
1answer
67 views

Can a 0800 and 00800 be from different companies in UK [closed]

I recently received a call from a 00800 number, that seemed like a prerecorded message asking me to press some keys to continue. I disconnected. I later googled the number and I noticed that a ...
3
votes
1answer
333 views

Is a fake base station needed for IMSI catching?

If you read about cell phone tracking it looks an IMSI Catcher always uses a fake base station the get the phones IMSI. I don't understand why this is necessary. Couldn't they just passively read the ...
2
votes
3answers
3k views

how can I tell if I'm under IMSI cell phone surveillance

I've recently had an encounter with the law, the details of which I won't disclose here since the case is still in court. They took my phone, naturally. I deactivated it as soon as I was released ...
6
votes
3answers
402 views

Is Twitter digits login (sms auth code) insecure?

Twitter released(some time ago) a new kit named Digits which allows the client to login with a phone number and an authorization code (received through sms). I find it great for the user experience ...
9
votes
2answers
3k views

Phone calls that listen to you saying hello and then say “goodbye” [closed]

I live in France. About 5-10 times, once every 1-2 months, I receive an automated computerized call that listens to me say "hello" there is silence for 5 seconds, and then there is a voice recording ...
4
votes
2answers
1k views

Does a TMSI change often enough to prevent tracking?

A company called Path Intelligence has a product called Footpath which uses the TMSI, WiFi MAC address, and bluetooth MAC address to track phones as they move through stores. However, I don't see ...
0
votes
2answers
8k views

Why don't mobile operators blacklist stolen phones using their IMEI?

I've just read this piece of news that Android and Windows phones will get a 'killswitch', rendering them useless to potential thieves. However, since all devices have a unique identification number ...
1
vote
1answer
89 views

how do I find out where my sd card was used last [closed]

Someone took my sd card out of my phone and saved information on it that I didn't know about. Is there anyway to find out where my sd card was used last.
34
votes
5answers
19k views

What is preventing us from sniffing the mobile phone communication?

I'm learning wireless penetration testing. It really is amazing. But it made me wonder, what about mobile phones? They are also means of wireless communication. So, our entire voice must be in the air ...
22
votes
4answers
11k views

Are phone calls on a GSM network encrypted?

When I make a call on my cellphone (on a GSM network), is it encrypted?
1
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0answers
69 views

DLP for Phone calls [closed]

I would like to know if there is a DLP system that can monitor phone conversation, in order to search for sensitive data leakage by the company users to external users. We know NSA does that :) Is ...
4
votes
0answers
103 views

Deal with number changes in a phone number based authentication/login system

Twitter Digits (https://get.fabric.io/digits) provides an authentication/login system based on phone numbers for mobile apps, and several other mobile apps (e.g. Square Cash, ...
25
votes
9answers
11k views

Do secure phone lines exist?

I could be out of context here about security, but , I would like to know if phone lines or phone calls over VOIP could be made secure . I know that Skype and other VOIP service providers have to ...
1
vote
2answers
132 views

Anonymity of prepaid SIM card in phone linked to real identity

I want to use a prepaid SIM card (text and calls only) anonymously. I bought the SIM card offline without providing any address or name. I am now thinking about using a dumbphone I bought from Amazon ...
1
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0answers
37 views

How to prevent location information from any dialing call [closed]

Assume you receive many unknown calls from unknown numbers regularly. You would like to prevent the callers to receive any pieces of information from you. How can you do this? Your number is ...
52
votes
5answers
11k views

Is sending passwords through cellphone text messages secure?

Both the sender and the receiver deleted the text after it was sent, but is it still possible that it exists somewhere and that someone can get to it?
6
votes
2answers
12k views

Is it possible to crack a PIN / PUK code on a phone SIM card?

When deploying a mobile phone best practices policy, one of the points which were raised was the requirement for the user to protect his SIM card with a PIN. The theory is that three failed attempts ...
5
votes
4answers
385 views

Why do phones have SIM cards? [closed]

I presume that the main reason phone operators require a SIM card to get access to the network is due to security and/or authentication purposes. Just wondering why this is? What does a SIM card do ...
1
vote
3answers
3k views

How can hotels securely receive your credit card details (for a custom, one-off payment)?

A hotel belonging to a large chain (400 hotels in 60 countries) has just requested me to send my credit card details via standard (unsecured) email. I have negotiated a deal for accommodation with ...
5
votes
2answers
597 views

Has there been any documented cases where hackers have hijacked the phone number to a business?

Has there been any cases where hackers have taken over the phone number to a business, by creating a phone number in the same area code, setting up a virtual PBX / Asterisk system, routing all calls ...
1
vote
2answers
125 views

Eavesdropping phones in offline mode or when switched off

Occasionally there are reports about eavesdropping via phones which are switched off or in offline (or airplane) mode. People put their phones in the fridge or remove the batteries to prevent such ...
-4
votes
1answer
94 views

How am I affected by malware? Malware transferred from service provider's base station or just port scan? [closed]

I need a malware expert here. I am being targeted by advanced hackers over the 4.5 years. So this is my situation: 1) My new phone: I just bought a new phone, with SIM card and mobile internet plan ...
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votes
1answer
83 views

Can malware “upload” itself to the actual mobile base station and regain back to another phone?

My question is can a malware from my affected phone "upload" itself to the ACTUAL REAL mobile base station from the service provider, and regain back to my another phone with the same number (same ...
2
votes
2answers
153 views

What's the worst someone could do with my phone unlock code?

When someone is using my cell phone, I will sometimes give them the PIN number to unlock it so they don't have to ask me. Clearly, I only tell the code to people I trust not to mess up my phone. ...