Most handsets have security measures built into their firmware that protects them from repeated attempts to guess the unlock code. After entering more than a certain number of incorrect codes the phone becomes frozen. This is a state where the phone will display a security message that the phone needs a service. Older phones could no longer be used at all at this point, however modern smartphones often keep working with the original SIM but require extra work to then unlock them correctly. In extreme situations physical access to internal hardware via in-circuit debugging may be utilised (for example, via JTAG headers on a circuit board). Such access may be required to modify initialization software used for booting.
Vodafone Smart 2 Unlock Nck Dongle 17
In some cases, a SIM-locked handset is sold at a substantially lower price than an unlocked one, because the service provider expects income through its service. SIM locks are employed on cheaper (pay-as-you-go) handsets, while discounts on more expensive handsets require a subscription that provides guaranteed income. Unlocked handsets have a higher market value, even more so if they are debranded. Debranding involves reflashing or replacing the firmware to remove the operator logo or any limitations or customizations that have been imposed on the handset by the operator, and is usually accomplished with software designed for a particular handset model, however most smart-phones can be debranded and unlocked solely with use of special software.
Japan's Ministry of Internal Affairs and Communications has legislated that all smartphones and tablets released after May 1, 2015, by NTT DoCoMo, au/Okinawa Cellular and SoftBank Mobile (the three major carriers in Japan) must be sold without a SIM lock upon request from customers and without any cost to the customer involved. Before that, from 2011 until 2015, only NTT DoCoMo and au/Okinawa Cellular would remove the SIM lock from phones with a SIM unlock function after the phone is kept or used at least six months after purchase.[44] 2ff7e9595c
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