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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29
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3answers
12k 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
106 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 ...
5
votes
1answer
310 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 ...
10
votes
5answers
6k 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
138 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
90 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
101 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
88 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
159 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
492 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 ...
56
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
94 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
4k 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
103 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
68 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
174 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
votes
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
votes
5answers
10k 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
379 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
43 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 ...
30
votes
5answers
19k 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 (http://www.politechbot.com/docs/fbi.ardito.roving.bug.opinion.120106.txt) referenced a bug that could track/listen in on the ...
5
votes
2answers
113 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
48 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
47 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
744 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
189 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
381 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
102 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 ...
29
votes
5answers
15k 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 ...
0
votes
0answers
32 views

Is there any benefit to re-verifying someones identity on the phone once transferred?

So this example is quite specific. You call up an organisation and they verify your identity using two pieces of information (eg; date of birth, last payment date, mothers maiden name). But then once ...
1
vote
2answers
160 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 ...
1
vote
1answer
215 views

How secure are DECT and 5.8Ghz Digital Cordless home Phones?

Is it safe to assume someone with $1,000-$3,000 U.S. to throw around can purchase the expertise or equipment to tap someone's modern cordless phone via a vulnerability, or otherwise? I mean someone ...
12
votes
2answers
37k views

How to spoof a cell phone tower (cell site, base station) — homemade IMSI-Catcher

An answer to a recent question has given me an idea for a school project (security CS program). Also, an active attacker (with a fake base station) can potentially force a mobile phone to use ...
6
votes
3answers
5k 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 ...
4
votes
2answers
712 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 ...
9
votes
5answers
7k 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 ...
3
votes
1answer
14k 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, ...
0
votes
0answers
11 views

Multiple service providers to establish link

If data roaming is disabled, could service providers still use links from multiple service providers to establish connections between a carrier and a destination point?
36
votes
6answers
25k 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 ...
6
votes
4answers
27k 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 ...
1
vote
2answers
281 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 ...
70
votes
7answers
24k 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 ...
3
votes
1answer
226 views

Smartphone motherboard - Does it hold any data?

I recently went for a smartphone repair and got its motherboard replaced. However, it didn't occur to me to ask for the damaged motherboard back. I had confidential credentials and data stored. No ...