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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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Would removing a SIM disable the phone number and block text scams

I have a PAYG basic Nokia mobile, not a smartphone, and have noticed on my EE A/c there is a transaction for a Text Service with a charge of 15p, appearing every so often, which is nothing to do with ...
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can an attacker intercept phone call if he has access to my sim?

I read here and here that an attacker, that has physical access to my SIM, card could be able to extract the encryption key from my sim and then intercept and decrypt phone calls. This can be true ?...
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1 vote
1 answer
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What is the most secure internet access option for Android phones?

My goal is to make one of my android phones as secure as possible, hence the question: What is the most secure way for an Android phone to gain internet access? Options I (think I) have: The phone ...
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-1 votes
1 answer
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Is a 2fa app really better than SMS 2fa with sim-pin?

A sim-pin safeguards against sim-swapping, which is the primary advantage of using an authenticator app instead of SMS, is this not so?
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What are the pitfalls of adding a corporate eSIM to an unmanaged employee device in lieu of land-line phones?

Instead of having a landline at each employee's desk, allow them to add an eSIM to a compatible personal cell phone. (If possible, disable SMS for the added eSIM so it is acting as a replacement for ...
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What equipment would an attacker need to infect a SIM card?

I'm aware that SIM cards can store malware according to this question but what equipment would be needed to do such an attack? For example, would you need a Computer and a SIM card reader or could it ...
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2 votes
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How much of a security threat to the PC is a SIM card running applets when plugged into a USB modem?

Background A customer complained to a mobile phone company that they were receiving messages that were leaving the screen turned on until it was noticed by the customer (usually many hours) by which ...
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How can you spoof you caller id but not using a voip (your carrier instead)?

My research: I found this security stackexchange post but it didn't answer my question. I know that you can do similar things using astresik with voip provider. I came up on o blog that explain that ...
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1 vote
1 answer
171 views

Avoiding carrying my main SIM card

In many countries, for example, Russia where I live, you need to show an ID to obtain a SIM card. Often this is used by law enforcement to track people. Sometimes corrupt officers sell people's ...
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2 votes
2 answers
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Will Google Authenticator stop a sim-swap attack from compromising my Coinbase?

If I use Google Authenticator for Coinbase, and someone sim-swaps my phone number and gains full access to my email account, can they drain my Coinbase account? They would be in control of my email, ...
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176 views

Dangers of switching sim from old phone to new one

I would like to know the dangers of switching an old sim card from an old phone to a new one. I recently got a new phone and a paranoia woke in me. Lets assume that the old phone was infected with ...
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3 votes
2 answers
464 views

Can you connect to a mobile network without a SIM?

I know during emergency calls we can connect to our mobile networks without using a SIM and make calls. So it's technically possible to connect. The SIM card holds encrypted info on how to ...
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2 answers
174 views

What makes this cellphone (and the weird instructions) so privacy-friendly?

I stumbled upon this weird product in a webstore primarily selling Cannabis-related products (not the actual herbs): https://smoketower.com/nyheter/Anonym-3310-mobiltelefon I've manually translated ...
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Can I determine whether my phone probes base transmission station (BTS) without a SIM card?

This question is related to another inquiry on this site: Can Android phone running without SIM card be tracked (localized) by police? Accepted answer claims that: Without a SIM, your cell phone ...
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35 votes
6 answers
5k views

How to protect against SIM swap scammers?

SIM swap occurs where the scammer uses phished information about you to request a SIM card replacement from your cell phone carrier, by tricking them into believing that it is you who is making the ...
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264 views

Should I occasionally replace my SIM card for security reasons?

To be able to use mobile data (e.g. 4G/ LTE) and mobile telephony (e.g. VoLTE) services on my smartphone, I need to put a SIM card into my smartphone (I know embedded-SIM/ eSIM exists but let's ignore ...
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Is hacking email with simjacking a concern if you don't have 2FA for the email?

I've been doing some reading on simjacking lately, mainly around how one may be compromised. One common tidbit I read is that you can access your email and your other financial services if you have ...
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3 votes
2 answers
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Does replacing the SIM card mitigate any threats after a serious data breach?

I recently heard that a telephone company (a mobile network operator) was hacked and lots of data was stolen, maybe affecting up to a million customers. It sounds like the leaked data is already ...
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17 votes
3 answers
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Real life examples of malware propagated by SIM cards?

The laptops in use at my company have SIM card slots, which are actually used by some of our users. I am threat modeling our devices, so I was wondering if there are any realistic exploits that can be ...
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5 votes
1 answer
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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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2 votes
1 answer
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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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2 votes
3 answers
285 views

My SIM card was stolen. What info besides contacts does it store?

And can they break the PIN number easily?
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-1 votes
1 answer
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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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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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1 vote
1 answer
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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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9 votes
1 answer
5k views

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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1 vote
1 answer
172 views

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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2 votes
1 answer
828 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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9 votes
1 answer
1k views

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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1 vote
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SimJacking protection [closed]

How do you protect your mobile phones from SimJacking?
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23 votes
3 answers
3k views

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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1 answer
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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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2 votes
1 answer
10k views

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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3 votes
1 answer
685 views

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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278 views

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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1 vote
0 answers
165 views

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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3 votes
1 answer
390 views

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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2 votes
2 answers
327 views

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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1 vote
2 answers
2k views

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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1 vote
0 answers
283 views

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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3 answers
1k views

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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3 answers
3k views

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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1 vote
2 answers
5k views

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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2 votes
1 answer
950 views

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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1 vote
3 answers
17k views

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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