SIM locking
US9425844B2 · kind B2 · utility
1Cited by
0References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 22, 2011 |
| Grant date | Aug 23, 2016 |
| Priority date | — |
| Expiry date | Dec 22, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W12/08
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Where a smartcard is embedded or inaccessible within a cellular telecommunications device (i.e. an eUICC), locking the smartcard (or the subscription associated with the smartcard) to a particular MNO while allowing the MNO to be altered legitimately presents a challenge. A method is described using policy control tables stored in a trusted service manager registry and/or the smartcard's data store. By maintaining the policy control table, any MNO subscription may be downloaded/activated on the smartcard but the device will be prevented from accessing the desired MNO because that access would violate the lock rules.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.