Hello,
As you know when a SIM card is cloned, the result is that there are two SIMs with the same IMSI, etc number.
So, do you think can both this SIM cards connect simultaneously to GSM?
Or how does GSM network act in these cases?
Or the first one connects and the second one fails to connect because no two SIMs with the same IMSI can be online simultaneosly?
And finally can GSM operators detect a cloned SIM card is on their network?
Thanks in advance.
I presume it highly depends on the network and on the type on controls performed on it.
I mean, two "identical" SIMs on the same cell NO.
Two "identical" SIMs on different cells, probably yes.
And what about using other networks (such a as a roaming from another state/country).
I don't think there can be a "real time" check for "duplicates" connection worldwide.
I remember reading there are some forms of control for non-simultaneous hooks of same SIM on different cells, like connection to cell "A" and after 5 minute connection to cell "B" situated 100 Km afar from cell "A", which result in "blacklisting" the SIM.
jaclaz
Thanks jaclaz for the answer.
You say "Two "identical" SIMs on different cells, probably yes."
I have a question then. If two identical SIMS on different cells could be online simultaneously, then what will happen when somebody calls the number of those idential twins?
How would the GSM decide to which SIM the call should be directed as there are two identical SIMs.
Thanks jaclaz for the answer.
You say "Two "identical" SIMs on different cells, probably yes."
I have a question then. If two identical SIMS on different cells could be online simultaneously, then what will happen when somebody calls the number of those idential twins?
How would the GSM decide to which SIM the call should be directed as there are two identical SIMs.
I *presume* that a continuously updated list of SIM's hooked to a cell is transmitted to a "hub" and then from various "hubs" to a "master list" of some kind but there must be some kind of "lag", thus last "floating" data will probably be used first.
Think at it as a LIFO stack.
http//
jaclaz
Yunus, do you have something specific here or is this just a theoretical discussion?
well no…
first of all
a cloned SIM, to be able to connect to the GSM network must have
a valid IMSI, a valid ICCID, and a working KI
the KI is encrypted in the SIM and provides the informations for authenticating with the network provider.
btw, two sims cant exist on the same network becouse the IMSI is verified in the carrier database, and not on the BTS level,
so even if the cell is different, two sims cant be online at the same time.
i dunno if some network operators allow two IMSI to be online at the same time, but it would break the standard and any security feature.
even "twin sims" dont have the same IMSI, but the twinning is managed by the carrier DB.
Yanus
Is this question regarding a SIM card clone for a forensic exam (e.g. XRY Cloner) and a live SIM? or are you asking about if two 'live' SIMs being connected at the same time?
Yanus
Is this question regarding a SIM card clone for a forensic exam (e.g. XRY Cloner) and a live SIM? or are you asking about if two 'live' SIMs being connected at the same time?
a forensic clone cant connect to the gsm network, i think that if he's asking if 2 sims can connect at the same time, he's dealing with live clones (the ones where both ICCID, IMSI and KI are present on the SIMs)