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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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138 votes
8 answers
71k 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 ...
Paul Podlipensky's user avatar
56 votes
5 answers
47k views

Are phone calls on a GSM network encrypted?

When I make a call on my cellphone (on a GSM network), is it encrypted?
Ram Rachum's user avatar
  • 2,058
17 votes
2 answers
3k views

Protecting cellphones from USB attacks (a.k.a. Juice Jacking)

We have several smartphone with encrypted data on them (BES, iPhone, Android) and want to prevent an unauthorized person from downloading information from the device via USB. The visual assumption ...
makerofthings7's user avatar
7 votes
1 answer
574 views

Should 2FA over SMS be considered insecure in the wake of recent SS7 attacks?

Design flaws related to SS7 has been known to us for quite a while now but telcos have conveniently discarded the arguments saying that the risk is too low due to the significant investments required ...
hax's user avatar
  • 3,941
58 votes
7 answers
12k 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 ...
stumped's user avatar
  • 549
39 votes
5 answers
89k views

How to trace a (mobile) phone?

Even since growing up, I've watched films in which the "bad guy" is repeatedly tracked down when they call the police or FBI or police force de jour. They always have "about 30 seconds". Regardless ...
logicalscope's user avatar
  • 6,374
8 votes
2 answers
2k 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 "...
Eddie Studer's user avatar
  • 1,039
31 votes
2 answers
190k views

Can Android phone running without SIM card be tracked (localized) by police?

I am running an Android phone without a SIM card. I am using it for web surfing. Can the police localize my phone using the cell towers (BTS)? In other words, I know Android phones emit radiations ...
yasserbn's user avatar
  • 413
24 votes
1 answer
18k views

How can I spoof a phone call and make it appear to come from another phone?

I'm performing a penetration test against a company. Part of my social engineering procedure is to contact the IT department and try to convince them to that I'm an employee in the company and get ...
Adi's user avatar
  • 44.1k
16 votes
3 answers
1k views

Should 2-factor authentication using SMS be deprecated?

Google, Facebook and most of the important websites (banks, payment sites, etc...) use SMS as the major method for 2FA or for controlling the account (password reset, etc..). However, GSM was proven ...
T.Todua's user avatar
  • 2,727
43 votes
7 answers
48k 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 ...
Sam Skuce's user avatar
  • 573
34 votes
3 answers
3k 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 ...
dr jimbob's user avatar
  • 39.4k
14 votes
5 answers
28k 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 ...
user20702's user avatar
  • 159
9 votes
3 answers
35k 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?
user108810's user avatar
7 votes
2 answers
1k 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?
Qgenerator's user avatar
1 vote
2 answers
17k 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 ...
Laura B's user avatar
  • 39
86 votes
3 answers
15k views

Can phone apps read my clipboard?

Via Hacker News, I came across a Tweet implying that Facebook's iOS app routinely reads and transmits all content from the user's pasteboard. Leaving aside whether Facebook's app genuinely does this (...
Mark Amery's user avatar
  • 1,827
17 votes
3 answers
69k 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 ...
jtpereyda's user avatar
  • 1,600
10 votes
3 answers
5k views

Someone is making random calls spoofing my phone number. What to do?

For the past six months, I've experienced call-backs from foreign numbers (all within the EU) telling me that I had called them earlier. At first, I thought the calls are malicious. However, due to ...
pw_v's user avatar
  • 131
6 votes
1 answer
46k views

How to track a Spoofed SMS on Iphone

A mate pulled a quality prank on me the other day by sending me a SMS via a Spoofed number. He's bought a SMS gateway and can set the message ID/phone number to be 'God' (or whatever he wants(letters ...
NULLZ's user avatar
  • 11.5k
2 votes
2 answers
2k views

Can an android phone that is flashed to a trusted safe rom still be malicious?

I'm in the market for a new phone. The cheapest ones with decent specs are from China. Unfortunately I've read articles of phones sending data back to China for spying purposes. The phone I am looking ...
Terence Chow's user avatar
65 votes
5 answers
50k 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?
Rachel's user avatar
  • 661
43 votes
6 answers
47k 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 ...
claws's user avatar
  • 2,175
17 votes
3 answers
4k 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 ...
Tomer E.'s user avatar
  • 171
16 votes
2 answers
160k 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 ...
bandybabboon's user avatar
9 votes
3 answers
4k views

Can an infected phone infect other computers in a network?

Can an infected phone infect other computers in a network? For example do you need to worry about private phones in a company enviroment? Or is that already paranoid?
HopefullyHelpful's user avatar
8 votes
2 answers
1k views

How can I protect my phone voicemail from being hacked?

With the News of The World Phone Hacking scandal spreading globally amidst allegations that as well as celebrities, victims of September 11 and other major events in the news have had their phone ...
Rory Alsop's user avatar
  • 61.5k
7 votes
1 answer
42k views

Is there any way to detect caller ID spoofing? [duplicate]

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, ...
Ashish's user avatar
  • 81
6 votes
2 answers
13k 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 ...
user11272717's user avatar
6 votes
2 answers
3k views

Security implications of android rooting [duplicate]

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: ...
thomasUJ's user avatar
6 votes
4 answers
56k 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 ...
Ashamed's user avatar
  • 61
6 votes
2 answers
1k 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 ...
Andy's user avatar
  • 253
6 votes
3 answers
3k 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 ...
Niahc's user avatar
  • 163
6 votes
2 answers
18k views

Is it possible to un-spoof a spoofed caller ID?

I know that Trapcall allows mobile telephone users to forward their calls to a toll free number, which then forwards them back to the user's telephone, allowing them to see the caller ID. However, ...
JosephG's user avatar
  • 185
4 votes
3 answers
7k 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 ...
dodgy_coder's user avatar
2 votes
1 answer
7k views

Can you listen to your last GSM call recorded when calling back a user?

My wife called a GSM/3G number abroad and the call was dropped. She called again and she could hear the whole conversation repeated with the other party but with blank period from her side of the ...
Omar R's user avatar
  • 41
99 votes
3 answers
44k views

Does hanging up on a UK landline call not terminate the connection?

AgeUK (and others) warn about making phone calls directly after receiving a scam call and advise you to "wait for the line to clear": Use a different phone if you can, or wait 5 to 10 minutes after ...
Matt Zeunert's user avatar
  • 1,013
76 votes
11 answers
92k 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 ...
Andy Ray's user avatar
  • 1,138
69 votes
5 answers
31k views

Is a 'dumbphone' mobile more secure for basic phone calls than a smartphone?

By dumbphone I mean: no internet connection, very limited features, etc. By more secure I mean: secure from malicious and direct hacking. I don't mean as in protected from government tapping/snooping;...
infinite-etcetera's user avatar
47 votes
4 answers
25k views

Someone called someone else with my phone number

Sequence of events: I didn't touch my phone all day (at work, busy day, know it didn't even come out of my pocket, but was on). 5:20pm I get a call by a guy asking me who I am and why I called him at ...
VSO's user avatar
  • 523
46 votes
6 answers
120k 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 ...
John K's user avatar
  • 568
33 votes
3 answers
49k 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?
Ulkoma's user avatar
  • 8,763
32 votes
4 answers
1k 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 ...
android user's user avatar
30 votes
8 answers
19k 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 ...
Sairam's user avatar
  • 713
22 votes
3 answers
4k 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 ...
zx8754's user avatar
  • 331
21 votes
4 answers
4k 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 ...
user avatar
20 votes
3 answers
142k 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 ...
Peanut's user avatar
  • 1,039
16 votes
4 answers
6k views

Does two-factor authentication reduce the need for a long password? [duplicate]

I've recently enabled 2-factor auth on a number of web apps, mostly using Google Authenticator. Does this mean that the importance of a strong password on each site is reduced? I would prefer to use ...
Steve Bennett's user avatar
12 votes
4 answers
4k views

How to 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 ...
anon's user avatar
  • 121
9 votes
2 answers
55k 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 ...
WoJ's user avatar
  • 9,038