Questions tagged [simcard]

A subscriber identity module, or SIM card, is a circuit used to store the IMSI number and associated key used as authentication on mobile telephony devices (for example mobile phones and tablets).

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Reading public key from SIM card

Is it possible to get public key from SIM card with only TelephonyManager API. I know SIM card have CPU, RAM, ROM, EEPROM, Crypto-processor, etc... Inside ROM part here is Ciphers, public and secret ...
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Do mobile phones track sim cards?

I am using a Android ulefone, i was wondering if these devices or any device in general logs / keeps some memory of past used sim cards and ways to identify which ones they are etc.
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Can WhatsApp, Signal or Telegram be hacked through a SIM SWAP attack?

In Cuba the telecoms/ISP monopoly, Etecsa, works with the political police to spy on dissidents, journalists and others. A common attack in Cuba is therefore SIM Swapping which is easy for them. It is ...
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How is SIM blocking enforced?

The only protection features that mobile phones have to keep thieves that stole a target's device from impersonating that subscriber is the PIN/PUK system that's on by default on most SIM cards. The ...
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Massive operational security hole

Everything is based on phones now. If I have someone's phone I can reset their Salesforce password, access any SAS services etc. Assume this Hacker finds someone's phone number Hacker buys (or works ...
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What harm can a leaked IMSI do? [duplicate]

I know that subscribers can be tracked using IMSI. I also know IMSI follows a pattern of MCC+MNC+MSIN where MCC and MNC parts remain static for a certain PLMN. What changes is the MSIN part. As such, ...
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How can you check if a phone number was recently moved? (To mitigate SIM swapping)

I know never to use phone number as a sole or backup authentication factor. But if a customer forgets their password, and I want to use information they know about their account alongside access to ...
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My SIM card was stolen. What info besides contacts does it store?

And can they break the PIN number easily?
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Are the locations text messages are sent from logged?

When you send a text message from a phone with a sim card, is there a log which records your location at the moment, or any other information? is it linked to the phone? to the sim card? to both?
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Phone calls from unused simcard [duplicate]

How is it possible to receive a call from a number that is not inserted in a phone? My phone is a Samsung A20. It fell in the sea. The phone is dual sim and 2 sim cards were in the phone when it ...
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How I rescue my Android from a trojan and how did I get it? [closed]

I received a message with the famous link My-love co via Whatsapp and I never clicked on the link; I blocked the contact and deleted the message containing it; such a link was reported as infected by ...
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Does a SIM card still require a PIN even after being deactivated by the SIM-providing company?

For example, if I lost my SIM card (and stopped using it for years), and someone found it years later (after being deactivated by the SIM providing company due to extended nonuse), would the person ...
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esim vs sim card, what is more secure?

I can read many different attack vectors like swapping and porting but not sure if all those attacks are relevant about eSIM, can you please explain what are a security risk and attack vectors that ...
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Sniff the traffic of sim card [closed]

I wonder if Sim Card traffic can be sniffed? I mean only the internet connection when it makes to requests to several websites. Sniff those traffic by WireShark maybe? P.S: not messages, only network ...
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How to prevent sim swap to the most extent possible

There's a technique called sim swap, which enables a fraudster to transfer the victim phone number to an other sim, allowing a fraudster hence to read the messages but especially to empty out their ...
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267 views

Is a USB dongle with an active 3/4G data SIM trackable?

Let's say I buy a second-hand USB dongle and put in a pre-paid and unregistered data SIM card. At the time of the purchase of both items, my face was covered, I paid cash and I live 500 miles from the ...
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simjacker: which SIMs are vulnerable?

simjacker.com looks like a pretty serious security issue with SIM cards. There's not much technical detail on their website though. And it'd be nice to be able to already know which SIMs are ...
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SimJacking protection [closed]

How do you protect your mobile phones from SimJacking?
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Does the telecom provider need physical access to the SIM card to clone it?

In many dictatorships SIM card cloning is used by the police (working together with the telco) to spy on dissidents, journalists etc. Some people say that you need the authentication key on ...
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SIM cards - Keeping my phone calls secret

I'm traveling in Canada and I don't want to use my company phone for private calls. I am also interested in minimizing costs but I am more concerned about relative anonymity. So I bought a SIM card ...
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What happens if incorrect SIM card PUK entered 10 times?

I know that if incorrect SIM card PIN is entered three times, it is erased, so there is no longer any valid PIN, but user can set up new PIN with PUK. But when incorrect PUK is entered 10 times, it is ...
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Can websites uniquely identify users by the sim card used to access the website?

If I was to use a phone's data connection to access a website, and then pop that sim card into another phone to access the same website, could the website tell that I am the same user?
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Can mobile service providers use my iPhone's microphone to listen even when I'm not on a call?

So is this technically possible? Basically can the service provider somehow hack into my phone and use the microphone to hear the surrounding of my phone if they somehow have a backdoor/malicious code ...
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How can I test aspects of SIM cards? [closed]

In the past couple of months, I have had a bug in my SIM card. When data limit is reached, the SIM gives me free Internet at the speed of 10kbps. If I then switch my network type from 4g to 3g and ...
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Is Duo MFA vulnerable to a SIM swap exploit?

I'm looking into MFA options for a group of around 1000 people. Duo is intriguing, but I'm not sure I'm comfortable implementing something that incorporates text messaging (in contrast to something ...
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How do I protect myself against SIM hijacking/social engineering?

There are several posts like these: https://medium.com/@N/how-i-lost-my-50-000-twitter-username-24eb09e026dd https://motherboard.vice.com/en_us/article/5984zn/listen-to-sim-jacking-account-ransom-...
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Trip to China - safeguarding phone and laptop

I am going to China for a 2 week vacation in a month I will be taking a Google Pixel with a Verizon SIM and using it while there. I assume that if I don't use a local SIM, it would be difficult for ...
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How do third party providers remove the SIM lock on a mobile phone?

There are third party providers online who offer to remove the SIM lock on mobile phones, by emailing the unlock code. All they ask for is the phone's IMEI and the network provider's name. In one ...
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Calling someone with a broken SIM card? [closed]

My friend broke her (Australian Telstra pre-payed) SIM card in half just so she couldn't be contacted anymore. Now every time I call her it's saying "The number you have called is not connected. ...
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Tracking phone in country when SIM is not supported [closed]

Can the police track my cell phone if I left the country and went to another one and the SIM card is not supported by the country I went to?
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If you phone is seized, can you erase sim or stop them from cloning?

If your phone (for example, an iPhone) gets seized by the police, do they have sufficient technology to copy sim card (or any data) even if you cancel you provider and put phone in lost mode? If so, ...
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Is it possible to track a SIM card even if the cell phone is turned off?

I'm wondering if it is technically possible to track a SIM card inserted in a cell phone with sufficiently charge in the battery.
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When it is possible to locate/trace SMS sender?

I have read this question (which is closed) and already answered. Quoting the answer: There is no location transmitted within a normal SMS message (unless added by the author) so as the ...
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Can an unregistered phone with a prepaid SIM card be traced by the police? [closed]

Let's say that someone is using an unregistered phone — I mean just a phone that he bought in another country — with a prepaid SIM card. The person is sending messages only on WhatsApp, without making ...
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If my Android phone has a virus, can I change its SIM into a new phone to get a clean start, or can the SIM carry over the virus?

I am considering switching my SIM card into a spare Android phone I have, in light of two issues: 1) My issue here: Suspicious text received from my # but I did not send it - is there definitely a ...
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755 views

Can you compromise a phone with a SIM card?

If you are traveling abroad and buy a prepaid SIM card to use in that country in your phone, what kind of vulnerability are you exposing yourself to? Can a malicious SIM access information on my phone?...
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What happens if an attacker steals my sim card number?

The Sprint chat guy asked for my sim card number (ICCID) and I'm a little concerned about how sensitive it is. One possibility I can think of is being able to intercept SMS 2-factor Auth.
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What are the physical security features that prevent the cryptographic data on a SIM card being read?

In his excellent answer to "How does a SIM card prevent cloning?", user Lie Ryan explains that SIM cards have their critical data stored in "tamper proof housing", protected by "physical security ...
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Can SIM card be locked to the specific equipment?

I'm curious if SIM card can be "personalized" to operate only in the specified mobile equipment in addition to usual PIN security. So the SIM extracted from "legitimate" phone and placed into ...
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How can I protect myself from someone taking over my mobile phone number?

I don't know much about security and don't know if these things are possible or not. Last night I received a text message stating "Please use ****** to authenticate your phone number in the DIGITS ...
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What software can be used to read data from smart cards? [closed]

I have recently got this smart card reader. In the description it says that it can be used to read data from fidelity smart cards, library cards, etc. The technical card compatibility support is as ...
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1answer
173 views

911 Authentication and Encryption

When I talk over 3G without a SIM, for which the only example I see is 911 emergency calling, is any encryption used? In other words, can a 3G eavesdropper understand any content of my 911 call? I ...
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SIM cards Trace to buyer [closed]

Hi I was wondering if a SIM card can be traced to the person you purchased it. Let's say I bought a SIM card and used it to make it look like a friend was sending messages could that card be traced ...
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Install SSL certificate from SIM card [closed]

Are mobile network providers able to store their own SSL certificate on SIM cards, and auto-import this certificate into trust store on mobile phones (Android/iOS)? I know that SIM cards can store ...
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Does old SIM-cards have the same security as new one?

As I am using an old (10-15 years) SIM-card, I was asking myself if the hardware and software on the sim-card is equivalent to the newer sim-cards. Are the old-sim-cards (10-15years) the same as the ...
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Shellcode Injection/Poisoning on Mobile Networks[GSM/LTE/CDMA-varaints]?

In the previous question(How do APN hacks work?) I have enquired about APN hacks but after reseaching more about cellular networks. I wonder has anybody attempted Remote-code execution/poisoning,etc ...
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I have a conceptual idea for a network that could obfuscate the geolocation of a mobile station. I would appreciate short, critical feedback

I am a student in network engineering, and I have a technical essay due on November 18th. I can choose the topic of the essay myself. I have a conceptual idea of a network that could help obfuscate ...
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Can the police track my phone even if I remove the SIM card?

If the Police have your mobile phone number then I understand they can track your mobile phone. Now, I understand the mobile phone number is linked to the sim card but if you simply change the sim ...
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Protection from Sim Card Cloning [closed]

My friend had a problem with her phone. Somehow it was acting weird, I knew someone was hacking her. I tried to help her by doing a PIN Lock and a factory reset of her android phone (version 6.0), but ...
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Can location apps locate a lost phone if someone switches out the SIM card?

I lost my T-mobile Galaxy S7 somewhere between the front seat of my car in the parking lot at the grocery store and the first few aisles inside the store. (None of us remember exactly if I actually ...