Forum > Sony Ericsson / Sony > Tips and tricks > What is the Extended SIM lock?

• Network lock – locks the phone to a specific network defined by the mobile country code and
the mobile network code.
• Network subset lock – locks the phone to a specific subset of the network.
• Service provider lock – uses the group identifier on the SIM/USIM to lock the phone to a specific
service provider.
• Corporate lock – uses the group identifier to lock the phone to SIM/USIM cards that belong to
a specific company.
• Cooperative network list – locks the phone to a specific group of networks. This lock can be a
combination of any or all the locks listed above.
• SIM lock – locks the phone to a specific SIM/USIM card.
• Extended SIM lock – an Ericsson-specific lock that adds greater flexibility for handling special
operator requirements.
The Ericsson mobile platforms also support auto-locking to a SIM/USIM card; that is, the phone
locks to the first SIM/USIM card inserted into it. The lock type can be one or more of the lock
types described above.