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Supported Android Version 6, 7, 8, 9+ Fast Calculator unlocking operation (S7,S7 Edge,S8,S8 Plus,Note 8) stock Not Lose Network OR SIMLock OR IMEI After update OR NV Rebuild Its Factory UnLock 100%(Three times faster than the old version)+ No Need To Flash COMBINATION ROM OR Any Files, Just unlocking With Stock ROM + Fixed error(Faild Writing Unlock Sec File) for G950U, G955U, N950U Android 8.0 < BIT5 >+ Add Automatically switch Fingerprint late 2 time+ Add Magager Resseler support member active+ Add support model :+ GALAXY NOTE 9: SM-N960U ( T+Mobile, MetroPCS Only )+GALAXY S9: SC-02K SVC38 SM-G960U SM-G960U1 +GALAXY S9+: SC-03K SVC39 SM-G965U SM-G965U1 +GALAXY NOTE 8: SC-01K SVC37 N950W N950U N950U1 +GALAXY S8: SC-02J SVC35 G950W G950U G950U1 +GALAXY S8+: SC-03J SVC36 G955W G955U G955U1 +GALAXY S7 Active: SM-G891A +GALAXY S8 Active: SM-G892A SM-G892U +GALAXY S7:+ G930U G930T G930P G930A G930V +GALAXY S7E:+ G935U G935T G935P G935A G935V +GALAXY NOTE 7: + N930U N930T N930P N930A N930V +CORE PRIME : SM-G360T SM-G360T1 +GRAND PRIME: SM-G530T SM-G530T1 +GALAXY J3 PRIME: SM-J327T SM-J327T1 +GALAXY J4 CORE: SM-J410F SM-J410G +GALAXY J4+: SM-J415F FN SM-J415G SM-J415GN +Galaxy J2 Pro: SM-J250F G M Y 250N +Galaxy J5 (2016): SM-J5108 J510F FN FQ J510GN +J6 Plus (2018): SM-J610F FN SM-J610G SM-J610GN +A6 Plus (2018): SM-A605F A605FN G A6050 A6058
A SIM lock, simlock, network lock, carrier lock or (master) subsidy lock is a technical restriction built into GSM and CDMA mobile phones by mobile phone manufacturers for use by service providers to restrict the use of these phones to specific countries and/or networks. This is in contrast to a phone (retrospectively called SIM-free or unlocked) that does not impose any SIM restrictions.
Most mobile phones can be unlocked to work with any GSM network provider, but the phone may still display the original branding and may not support features of the new carrier. Besides the locking, phones may also have firmware installed on them which is specific to the network provider. For example, a Vodafone or Telstra branded phone in Australia will display the relevant logo and may only support features provided by that network (e.g. Vodafone Live!). This firmware is installed by the service provider and is separate from the locking mechanism. Most phones can be unbranded by reflashing a different firmware version, a procedure recommended for advanced users only. The reason many network providers SIM lock their phones is that they offer phones at a discount to customers in exchange for a contract to pay for the use of the network for a specified time period, usually between one and three years. This business model allows the company to recoup the cost of the phone over the life of the contract. Such discounts are worth up to several hundred US dollars. If the phones were not locked, users might sign a contract with one company, get the discounted phone, then stop paying the monthly bill (thus breaking the contract) and start using the phone on another network or even sell the phone for a profit. SIM locking curbs this by prohibiting change of network (using a new SIM).
In some jurisdictions, such as Canada, Chile, China, Israel, and Singapore, it is illegal for providers to sell SIM locked devices. In other countries, carriers may not be required to unlock devices or may require the consumer to pay a fee for unlocking.
A handset can be unlocked by entering a code provided by the network operator. Alternative mechanisms include software running on the handset or a computer attached to the handset, hardware devices that connect to the handset or over-the-air by the carrier. Usually the unlock process is permanent. The code required to remove all locks from a phone is referred to as the master code, network code key, or multilock code. If the phone is network locked it will typically display one of the following messages: SIM network PIN blocked, Enter lock PIN.
The unlock code is verified by the handset and is generated by the manufacturer, typically by an algorithm such as a one way hash or trapdoor function. Sometimes big telecom providers change the original factory unlock codes as an extra layer of security against unlocking services. For various big brands such as Samsung and Motorola there is no algorithm but just a random code generator where the unlock codes are programmed in the phone itself and then saved in a big database managed by the manufacturer. For the other brands where the unlock codes are still based on algorithms those are based on the IMEI number and the MCC code and have been reverse-engineered, stolen or leaked. Some handsets can be unlocked using software that generates an unlock code from an IMEI number and country and operator details using the algorithm specific to the handset. Other manufacturers have taken a more cautious approach, and embed a random number in the handset's firmware that is retained by the manufacturer and the network on whose behalf the lock was applied. These handsets can still be unlocked by online services that have access to either inside people with the manufacturer or with the telecom networks, or they need to be connected to the computer with a cable where specific software will bypass the security and SIM-unlock the phone. Sometimes this is done by advanced calculations to bypass the security the official way and other times using exploits or overwriting parts of the firmware where the lock status is kept, and often even recover a phone that is bricked or completely damaged in the software sense.
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.
A hardlocked phone is one in which a telecom provider has modified the firmware on the phone to make it impossible to manually enter the unlock codes in any way. The only solution to SIM-unlock such a phone is to change the firmware to a firmware which has not been modified by any telecom provider, a so-called \"unbranded firmware\".
Handset manufacturers have economic incentives both to strengthen SIM lock security (which placates network providers and enables exclusivity deals) and to weaken it (broadening a handset's appeal to customers who are not interested in the service provider that offers it). Also, making it too difficult to unlock a handset might make it less appealing to network service providers who have a legal obligation to provide unlock codes for certain handsets or in certain countries.
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.
The main reason to unlock a handset is to be able to use it with a different SIM card. Consumers may wish to continue using their previous provider with a new handset or when traveling abroad they may wish to connect to a foreign network with a prepaid subscription.
Nevertheless, the fundamental principle of GSM and its successors, is open interfaces which encourage competition among multiple vendors. This is the reason a mobile phone is, in fact, a combination of phone and the subscriber identity module (SIM). Locking the phone to a network is not much different from having the SIM built into the mobile phone. Network operators in many industrialized countries are not bound by law to give the phone unlocking code to subscribers even after the expiry of the contract period. Mobile phones with multiple SIM cards are quite common in India. Most phones sold in the UK are network locked and single SIM but SIM-free phones are available. 153554b96e