Multiple user SIM card secured subscriber unit
First Claim
1. A method of operating a subscriber unit having a SIM card reader, said method comprising the steps of:
- reading a first preprogrammed signature value from a primary SIM card;
comparing said first preprogrammed signature value to a preprogrammed signature value stored in said subscriber unit, said preprogrammed signature value being singularly unique to said subscriber unit;
enabling communications functions of said subscriber unit only if said first preprogrammed signature value read from said primary SIM card corresponds to said first preprogrammed signature value stored in said subscriber unit;
requiring a user to enter a password;
comparing said user entered password with one or more passwords stored in said subscriber unit, said password stored in said subscriber unit being uniquely assigned to said primary SIM card; and
permitting entry of additional signature values of one or more additional authorized SIM cards only if said user entered password corresponds to one of said stored passwords.
3 Assignments
0 Petitions
Accused Products
Abstract
A subscriber unit (101) includes a SIM card reader (107) for receiving a SIM card (105). The subscriber unit (101) is serialized and has stored therein an alphanumeric signature value which is associated with the specific serialized subscriber unit (101). The subscriber unit (101) is fully operable only with a SIM card (105) having stored therein the specific signature value corresponding to the serialized subscriber unit (101). A user having a SIM card (105) containing the specific signature value for that subscriber unit can select a mode of user operation which will permit multiple selected SIM card holding users to use the subscriber unit.
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Citations
5 Claims
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1. A method of operating a subscriber unit having a SIM card reader, said method comprising the steps of:
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reading a first preprogrammed signature value from a primary SIM card; comparing said first preprogrammed signature value to a preprogrammed signature value stored in said subscriber unit, said preprogrammed signature value being singularly unique to said subscriber unit; enabling communications functions of said subscriber unit only if said first preprogrammed signature value read from said primary SIM card corresponds to said first preprogrammed signature value stored in said subscriber unit; requiring a user to enter a password; comparing said user entered password with one or more passwords stored in said subscriber unit, said password stored in said subscriber unit being uniquely assigned to said primary SIM card; and permitting entry of additional signature values of one or more additional authorized SIM cards only if said user entered password corresponds to one of said stored passwords. - View Dependent Claims (2, 3)
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4. A subscriber unit useable with a SIM card, comprising:
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a SIM card reader for receiving and reading information stored on said SIM card; a display means for prompting a user to enter a password; user means for said user to enter a user password; a memory storing a predetermined first signature value, said predetermined first signature value being unique to said subscriber unit, said memory also storing a user password for said SIM card; a controller for comparing a signature value stored on said SIM card with said predetermined first signature value stored in said memory, said controller denying access to at least certain functions of said subscriber unit if said signature value of said SIM card does not match said predetermined first signature value, said controller allowing access to substantially all functional operability of said subscriber unit if said signature value of said SIM card matches said predetermined first signature value; and said controller comparing said user entered password with said stored user password and permitting entry of additional signature values of one or more additional authorized SIM cards only if said user entered password matches said stored user password. - View Dependent Claims (5)
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Specification