| SIM lock is a feature that is
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| | that the user can only use the SIM cards
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| particularly designed by mobile phone
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| | for the particular service provider. This
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| manufacturers and it is an in-built
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| | is particularly useful for pay as you go
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| system embedded into GSM phones. The main
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| | mobile phones.
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| motto of the SIM lock feature is to
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| | The SIM card made as country specific is
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| accessibility of network providers to
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| | workable within a specific country or
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| limit the use of their subscribers'
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| | group of countries in particular.
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| phones up to specific region (mainly
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| | Laws on SIM locking
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| countries) and to certain network
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| | The laws governing SIM locking system is
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| providers.
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| | entirely dependable on different
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| At present, the SIM lock is dependent on
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| | companies. In case of particular
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| three modes of operation:
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| | providers like AT&T Wireless, it never
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| · The type of SIM: It implies that only
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| | allows unlocking to its customers,
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| a certain type of SIM can be used in a
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| | whereas the new AT&T allows unlocking to
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| particular mobile
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| | its customer after 3months successful
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| · Network service provider: It implies
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| | standing on their part.
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| that the connectivity will be restricted
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| | There are various rules in different
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| depending upon the network service
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| | countries that are truly dissimilar than
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| provider, for example, T-Mobile, AT&T
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| | others. For example, in Belgium, the act
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| · Country specific: It implies that the
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| | governing the communication does not
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| phone will be workable in a particular
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| | support any locking feature in mobile
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| country, but not in the other
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| | phones. Therefore all of the mobile
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| Types of SIM locking
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| | phones sold in Belgium need to be
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| Essentially there are three types of SIM
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| | unlocked.
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| locking features available in the market.
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| | The laws are quite different in
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| The hardest and most difficult type of
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| | Netherlands and Spain where the service
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| lock is SIM card lock; this implies that
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| | providers need to deliver the unlocking
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| a phone is workable with only one SIM.
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| | code along with the mobile phone at the
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| This is difficult in terms of changing
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| | time of selling. This may be chargeable
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| the mobile itself once the SIM gets
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| | for an initial duration of 12 months in
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| damaged.
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| | some cases.
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| The most commonly used SIM lock option is
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| | On the other hand, in Hong Kong and
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| service provider lock or SP lock. It
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| | Finland carriers in particular are not
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| depends on the physical network that many
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| | eligible to sell locked mobile phones to
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| of the service providers may access. When
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| | their customers; however, exceptions are
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| SP lock option is enabled, it affirms
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| | there for particular sets.
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