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

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
70 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
46 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 ...
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2answers
75 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 ...
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votes
2answers
76 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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1answer
45 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.
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1answer
43 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
22 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 ...
1
vote
1answer
64 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 ...
9
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2answers
2k 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 ...
1
vote
1answer
77 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.
39
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 bring my own phone. I am considering using my own phone, to avoid having an extra device, but I want to better ...
4
votes
0answers
77 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, ...
6
votes
3answers
313 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 ...
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vote
2answers
113 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
vote
0answers
35 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 ...
51
votes
5answers
10k 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
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4answers
335 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 ...
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vote
2answers
106 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 ...
2
votes
1answer
2k 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, ...
-4
votes
1answer
89 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 ...
3
votes
1answer
284 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 ...
-1
votes
1answer
77 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
144 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. ...
-3
votes
1answer
183 views

Are there any ways to track mobile phones like shown on television? [duplicate]

Are there really some ways to get the Geo-Location of a mobile phone? I've seen in many TV crime shows (like "Sawdhan India" and "Crime Patrol") where the Police Force catches a criminal through ...
3
votes
4answers
250 views

Can my phone be affected by malware through mobile phone signal?

My phone is newly bought. Can a hacker actually scan the mobile phone signal around me, detect it, and put virus/malware into my phone THROUGH the mobile phone signal of my mobile service provider? ...
2
votes
6answers
211 views

Deterring Mobile phone Tethering in the workplace

How do you put in controls to prevent a staff using his/her mobile phone to tether 3G/4G connection and download unauthorized files onto the office PC? Of course minimally there must be an AV in ...
5
votes
2answers
457 views

How are “fake cell towers” detected

With the recent (and not so recent) news about fake cell towers popping up in different part of the world, I was wondering how these are detected (from a technical point of view). I'm not really ...
1
vote
1answer
189 views

PCI DSS - Recorded Phone Conversations

I am using the using the following image from FishNet Security as a sort of guide for the data flow diagram required by PCI DSS as defined by: 1.1.3 Current diagram that shows all cardholder ...
0
votes
1answer
154 views

Phone got pick pocketed and I got a huge bill

I'm really sorry if this is posted in the wrong section. I did spend some time trying to get it right but I am not sure if this is... I have been exposed to thieves who have stolen my phone and then ...
2
votes
3answers
185 views

If a phone is encrypted at a platform storage level do I need to encrypt my data stored on it?

I am writing a mobile app which would be expected to store sensitive data. It needs to be stored for offline use. I am wondering now that Android and iOS provide encryption at rest do I need to ...
1
vote
1answer
153 views

Secure voice app [closed]

When I look in the Google play store (android apps market), I see that there are a lot of apps to make secure phone calls. However, all the apps I have seen so far all seem to use data packets over ...
3
votes
1answer
116 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 ...
0
votes
1answer
45 views

How to restore devices like IP phones to productive use after unexplained activity? [closed]

I'm trying to consider how to properly vet devices that have exhibited unexplained activity for future deployment. Let's just consider my current scenario as an example, but I am interested in this ...
17
votes
3answers
2k views

Is my phone carrier monitoring my traffic?

Today I started using a VPN on my phone (nexus 5), and after I switched on mobile data and turned off my WiFi, I received a text message from my carrier offering me roaming packages for Europe (which ...
27
votes
3answers
5k 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?
12
votes
2answers
1k views

Should I change phone number and e-mail address after PayPal fraud?

I have been the victim of PayPal fraud. I hadn't used PayPal in a year and then within 9 days there were three unauthorized transactions on my account for a total of 150 Canadian dollars and 290 ...
1
vote
3answers
601 views

Phone location detection

If someone posts something on the internet using their phone's data connection, is it possible to track their location? For example, somehow link their IP address and figure out their location. Or ...
1
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1answer
94 views

Suspicious phone call claiming MS Office not updated lately

I recently received two phone calls where the caller indicated that according to their log activity, MS Office has not been updated lately. They offered to help me get those updates. What kinds of ...
0
votes
1answer
119 views

Can strangers use Wifi to dial calls from my phone?

I watched an old episode of The Real Hustler in which they demonstrated how strangers can use some devices to force your Bluetooth-enabled mobile phone to call a premium rate telephone number. The ...
5
votes
5answers
4k views

Is it possible for a phone to be transmitting even while turned off and the battery removed?

Is it technically or theoretically possible for any part of a mobile phone's circuitry to be still on and transmitting even while turned off and the battery has been removed? If so, how? I am ...
6
votes
3answers
2k views

Do cell-phones exist with open source baseband processors?

In a recent question (can't seem to find now), someone asked: Is it possible to track a phone which is off? and received a response of Who's to say that it's really off? Your phone has both ...
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vote
3answers
108 views

Are dialers obsolete?

My antivirus picked up an infection by Dialer/Coulomb. The definition of a dialer is a piece of malware that dials a number that charges money. How would it do this, is this from when modems were ...
-2
votes
1answer
71 views

Voicemail PIN reset - what is a DDN? [closed]

Here is a recording of Glenn Mulcaire using social engineering to reset the PINs to voice mailboxes to which he did not have authorised access. (At least, that's my understanding.) He appears to say ...
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 ...
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 ...
1
vote
0answers
48 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 ...
-2
votes
1answer
153 views

How do i defeat cell phone spyware? [closed]

I've bought a new phone, where one of its products can be activated by receiving a phone call. If someone uses a spoofed SIM card - with a number I recognize - I'll likely answer the call. Are there ...
6
votes
2answers
11k 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 ...
1
vote
3answers
234 views

Touch tone phone username and password

I just got off the phone with Fidelity, who manage the health benefits for the company where I work. Before talking to a person, I was prompted to enter my username and password on the numeric keypad: ...