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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18
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3answers
606 views

Android security without updates

I have an android phone which, like many others, has quickly become unsupported and is not receiving any updates. At the same time there are publicly available exploits for privilege-escalation ...
8
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4answers
1k 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 ...
-4
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0answers
27 views

What to do/report for unnervingly generic phone call? [closed]

I glanced at Extremely suspicious phone call -- what to do? and I think I have a slightly different call setup. Basically, from the time I called back (the number shared my U.S. local area code), it ...
1
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1answer
121 views

I'm called several times per day by the same number but I hear nothing. What security implications can it have?

For some time, I'm called several times per day by the same phone number. If I answer the call, the line is completely silent. On only one occasion I heard a standard "elevator music". No matter what ...
1
vote
1answer
71 views

What things can the other person see about my phone when I pair it using bluetooth?

I need to know some correct information about bluetooth pairing technology. What are the things which becomes visible to the person about my phone when I'm using bluetooth from my phone and pairing it ...
-1
votes
1answer
72 views

How risky is it to disclose your IMEI number? [duplicate]

What will happen if I have mistakenly given my Android phone IMEI number to my IT colleague at my work place? How risky is it? I have asked him to delete my IMEI number. How can I be sure that he is ...
0
votes
2answers
119 views

Threatening text messages on my cell phone, 120 in one day but no phone number for sender, how do I get this info?

Threatening text messages on my cell phone, 120 in one day, but no phone number for the sender, how do I get this info? I think they were sent via home pc. What type of wording, code, etc. should I ...
2
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2answers
152 views

Phone Call from weird number

I just got a call from a very weird number. On my phone it displays as "+1 (1) (5 )" and "USA" below. I answered the call and there was 100% silence. Then about 2 seconds later the call ended. Next ...
22
votes
3answers
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 ...
1
vote
3answers
178 views

Can bad guys record phone conversations without the carrier's knowledge?

I know that, in most of the world, phone conversations are transmitted as digital data (whether frames in circuit switched protocols or packets). I know that several companies offer products which ...
4
votes
2answers
92 views

Difference between “Unknown” and “Hidden” Caller ID

I remember the times when I had an old Nokia phone as my main; there was some weird behaviour with Caller ID which was strange for me. When somebody with subscription to "Hide your number" service ...
28
votes
2answers
3k views

Why do web sites show my iPhone using different IP addresses for HTTP and HTTPS (cellular only)?

While testing a recent adtech integration I noticed something I can't explain. The iPhone uses two IP addresses. Seemingly one for HTTP and one for HTTPS. To further confuse things it only happens ...
33
votes
5answers
20k views

Can a powered down cell phone be turned on remotely?

I know this is tin-foil hat fodder, but at least one judicial opinion referenced a bug that could track/listen in on the subject "whether the phone was powered on or off," although that may have been ...
1
vote
2answers
116 views

What benefit is there to Craigslist's phone number masking?

Instead of including their phone number within the post body, Craigslist users are encouraged to enter their phone number in a separate input field. Then, when the post is displayed, a button appears ...
4
votes
1answer
50 views

What kind of information gets shared while pairing a device using Bluetooth? [duplicate]

I am using LGKp500 phone. My software version is KP500AT_V10h. Its a simple touch phone. It's not a smartphone. Now can anyone tell me, when Im pairing my phone with another phone using bluetooth (...
9
votes
1answer
415 views

Hacking/Sniffing/recording GSM like Karsten Nohl

For a course at college, I wanted to reproduce the attack on GSM shown in this video by Karsten Nohl: https://www.youtube.com/watch?v=0hjn-BP8nro. From what I understand he used an USRP radio to ...
29
votes
3answers
13k 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?
5
votes
3answers
127 views

Ways to protect phone from hacking through a wifi network when travelling

I'm planning on traveling to a resort in Mexico. The resort offers wifi, but I know someone who recently traveled to this resort and had their phone hacked via the wifi network. I would be wanting to ...
6
votes
3answers
2k views

Wouldn't forging the balance of a prepaid telephone card allow to make a lot of calls?

Suppose I have a prepaid public telephone card containing £5 in it. Now I connect this card to my laptop and figure out where in the card £5 is stored. I then change this to £5000, and leave the rest ...
10
votes
5answers
7k 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 ...
2
votes
0answers
23 views

How can I ensure that phone app traffic is using HTTPS? [duplicate]

When I access a website, I know just by looking at the URL whether it's HTTPS or HTTP. If I'm using an app on my phone, I cannot see this. So if say the app wants me to enter a password in to create ...
4
votes
1answer
207 views

Can a SIM card propagate malware?

Is it possible that malware can infect a SIM card? What will happen when I insert the SIM card in another phone?
1
vote
0answers
200 views

SS7 exploit on the wiretapping part

Wondering if there are info/source code/guide on the SS7 wiretapping part (SMS interception). I had a look on the track any mobile by a German researcher, and on PTsecurity about how the structure ...
74
votes
4answers
6k views

Charging someone else's cell phone in my car

A sketchy looking person walked up to my car the other day while I was parking and asked if he could charge his cell phone in my car and offered to pay me $5. I didn't allow him to charge his phone in ...
2
votes
1answer
111 views

How to verify if a phone number is an online SMS account as opposed to a genuine SIM card

We are using Authy for phone number verification on our website. It is very easy to create a free online SMS account through Twilio or other providers. Is there any way to determine whether the phone ...
1
vote
3answers
108 views

Can a telephone caller be authenticated?

If we assume that the human element is unable or not skilled enough to discover a phishing attempt (or some other malicious endeavor that can be perpetrated verbally), what forms of defense can be ...
24
votes
3answers
3k views

Listening to phone calls as user profiling for marketing [closed]

I had a landline phone call about xyz with an xyz-expert (also on landline) for about an hour, for the first time. After couple of days I started getting suggested links on websites as an ad exactly ...
-1
votes
2answers
225 views

How can someone spoof texts with my phone number?

A dear friend of mine in the U.S. recently told me that she had been quite hurt by the unkind texts I had sent her after the Holidays. I do not have a texting mobile phone, nor do I do texting from ...
9
votes
2answers
516 views

Random people are coming to my home looking for their lost/stolen cellphones!

Random people are coming to my home saying their lost/stolen cellphone is at my house! The latest person to show up on my door step was at 9pm last night. He said that his "findmyiphone" sent him to ...
58
votes
11answers
10k views

How would two people with burner phones communicate?

According to Edward Snowden in this tweet... Phones used in real-world ops are disposed on a per-action, or per-call basis. Lifetimes of minutes, hours. Not days. Let's imagine for a moment that ...
5
votes
1answer
95 views

Can I use a satellite phone for 2 factor auth sms and such?

Would 2 factor authentication SMS messages or other kinds of internet security notifications work with satellite phones? E.g. companies like Google, Paypal, Facebook, banking institutions and others ...
4
votes
2answers
5k 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 ...
3
votes
1answer
162 views

Google Hangout Dialler exposes user ID

Recently, I got in touch with an online supplier of commodity service. Since they are located in location out of country of my residence I used GoogleTalk's IP phone service ‘Hangout Dialler’ as it’s ...
28
votes
3answers
2k 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 ...
1
vote
2answers
73 views

Blackphone - Silentcircle - mobile apps

i have question about blackphone (silent circle). Is there any advantage over other mobile phones if i want to use third party mobile apps? So if I agree with terms of use of some applications, ...
2
votes
1answer
178 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 ...
0
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1answer
2k views

Tracing nuisance or malicious cellphone calls

Is it possible for an ordinary citizen to trace source of nuisance calls to cell phone when caller ID has been blocked?
42
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5answers
11k views

Is it dangerous to call spam phone numbers, even if you know they're spammers?

I sometimes like to check spam just to see how the messages look like, and I found someone who actually put an American phone number (1-XXX-XXX-XXXX). Most of these spammers are either trying to get ...
1
vote
2answers
878 views

Getting spam calls from numbers similar to my own

My phone number is 456-123-XXXX (American phone number + area code). Over the past few months I get fairly regular spam calls from other numbers also beginning with 456-123-XXXX, where the last four ...
3
votes
0answers
50 views

What are the security implication of implementing an IVR functionality in my application?

I am planning to implement an Interactive Voice Recognition (IVR) functionality in my python-based application. I will be using IVR as a backup verification method or when a user is going to setup her ...
5
votes
2answers
143 views

Security implications of android rooting

I know this question has been asked many times, but I didn't see a clear answer to it from security experts, or it is from several years ago and things might have changed. My question is double: ...
0
votes
0answers
16 views

Should I trust on Airpush and give IMEI? [duplicate]

For opting-out from air-push adds on android I can request to Airpush. Visit the relevant post: Is this red star icon malware? How to get rid of it? Is there a reliable way to detect the app ...
0
votes
1answer
53 views

Can IMSI catchers detect encrypted communications? [closed]

I would like to know if IMSI catchers can detect encrypted communications in general. Anyone got experience with that? Thanks
-4
votes
1answer
49 views

Using stingray against police (idea) [closed]

This is focusing on UK mainly, where police radios are similar to mobile phones. Pretend it's possible to buy Stingray, the IMSI scanner. Pretend Jimmy is a criminal, waiting for a police raid at any ...
5
votes
2answers
784 views

Phone call to try and gain access

About a hour ago I received a call from a suspicious phone number. They explained that they had received an alert from my PC and needed to gain access to correct the problem before my PC was "...
5
votes
2answers
204 views

What happens when you SIM-unlock a cellphone

In the UK the process for unlocking a mobile phone (cellphone) usually involves either buying an "unlock code" from ebay which you then have to put into the phone to unlock it, or taking the phone to ...
0
votes
1answer
568 views

How WhatsApp identifies a specific user

How does WhatsApp identify a specific user in order to forward the messages to him? Here is what I did: I backed up my iOS App from my old device Restored the backup to the new device Opened ...
0
votes
1answer
116 views

Mobile phone tracking, identification of the attacker [closed]

Once I was told that you can identify if your mobile phone is being tracked by someone (e.g. police), by calling placing a specific prefix to the number. This prefix in my country is normally reserved ...
32
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5answers
16k views

Are phone calls on a GSM network encrypted?

When I make a call on my cellphone (on a GSM network), is it encrypted?
-4
votes
1answer
63 views

sourcing harrassing texts [closed]

I live in the US. Someone is texting harrassing messages to me. I have done a reverse lookup which dead-ends in a landline number. The number I have has been confirmed by my wireless Carrier. It ...