What is a SIMLOCK

Zephyrlimit51讨论 | 贡献2020年4月17日 (五) 23:33的版本

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SIM lock:

A SIM-LOCK, Network-Lock, carrier lock, imei lock or (MASTER) SUBSIDY lock is actually a technical limit built into CDMA and GSM mobile phone devices by manufacturers to be used by carriers to restrict the use of these phones to a particular countries and/or networks. This is not like a mobile phone (retrospectively called SIM-free or unlocked) which doesn't enforce any SIM limitations.Generally if the phones were not locked, consumers may well sign an agreement with one supplier, get the marked down phone, then stop paying the monthly payment (thus breaking the contract) and start using the mobile phone on a different mobile phone network or maybe sell the phone for a profit. SIM locking reduces this by prohibiting a change of supplier (using a new SIM).

Unlocking Technology:

Usually, a locked mobile will show a message if a restricted SIM is used, requesting the unlock code. On new phone models working on Android software, the phone will display a message saying “SIM network unlock PIN” or “Enter Network Lock Control Key” if it's network locked. Windows phones will show the message, “This SIM card can only be used on specific networks. Contact your customer service center for the unlock code”. Several other handsets could display assorted messages that include "Enter special code" or "Enter unlocking code," or sometimes the handset will probably show a message stating that it is locked. After a valid code is keyed in, the mobile phone handset will display "Network unlocked” or “Network unlock successful”.


Handset companies have monetary incentives both to enhance SIM lock protection (which placates network organisations and allows exclusivity deals) and also to weaken it (increasing a mobile's appeal to customers who aren't interested in the service provider that offers it). In addition, making it very hard to unlock a phone might make it significantly less attractive to network service providers who have a legal liability to supply unlock codes for certain devices or in certain countries.

Unlocking Services:

Some companies offer a network smartphone unlocking service . This service requires those people whom need to unlock a mobile phone handset to supply their IMEI number to a service supplier and sometimes they will also require the country and service provider the mobile phone is locked to, often sent through email or submitted on their web-site. The organization then will provide (for a fee) an unlock code for the phone.

Unlocking Service Providers:

Disappointingly there are lots of fraudulent sites active in the smart phone network unlocking industry. As a result it is advisable to make sure you locate a honest provider for these services. To assist with your search for a legitimate service provider, we've provided a list below (and in no particular order) of a few legit organizations currently offering such services.

Reputable Mobile Phone IMEI Unlocking Service Providers: