Nokia said it is aware of commercial services that claim to provide caller identification or phone-number spoofing services, but in those cases the service provider acts as a proxy between the caller and the recipient, Nokia said.
But it is possible to have multiple phones running on a service provider's network that use the same phone number, said Sean Sullivan, a security advisor with the security vendor F-Secure in Finland. Usually, the last phone that used the network will be the one that receives inbound messages, he said.
"So if this particular Nokia 1100 can be modified to spoof the victims phone number, it should be possible to become the primary handset -- at least long enough to receive the TAN," Sullivan said.
But it is possible to have multiple phones running on a service provider's network that use the same phone number, said Sean Sullivan, a security advisor with the security vendor F-Secure in Finland. Usually, the last phone that used the network will be the one that receives inbound messages, he said.
"So if this particular Nokia 1100 can be modified to spoof the victims phone number, it should be possible to become the primary handset -- at least long enough to receive the TAN," Sullivan said.
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