The average user is not aware of the different between two major types of locks used to describe all locked mobile phone: manufacturer lock and network lock. In any country, including the US, there are a major number of smartphone owners with these 2 types of locks.
The main difference you need to know is that the manufacturer lock involves a SIM card, while a network lock does not. The network lock has the information of the carrier which is stored in your phone while manufacturer locked phones have a semi-universal security software lock placed on the SIM card slot that guides the phone what SIM card is going to be used.
Due to these reasons, manufacturer locked phones can be unlocked with a password that the manufacturer has. Once the passcode has been entered the phone is going to allow the use of any SIM card in the card slot, without any restrictions.
Network locked phones, on the other hand, don’t include this password unlocking feature, since they do not have a built in locking mechanism. They must be flashed with a particular firmware that has the carrier information in it before they can be used on another network.
Network locked phones can also be unlocked with the help of network unlock codes, which are similar in nature to subsidy codes in the perspective that special characters are inserted in the mobile in order to free it from a specific network.
Once the lock has been removed, the phone can then be used on any network as it then has the capability to communicate with other networks through the SIM card. The unlock does will be usually generated through an IMEI number for each phone model, and they will be a unique combination of characters that can be used to free the phone from restrictions imposed by a network.
It should however be noted that both kind of locks can be removed with the help of a genuine unlock service provider. As each phone carriers a 15 digit unique IMEI number, the unlock provider just needs that to unlock the phone. Both GSM and CDMA devices regardless of whether they are restricted on networks because of manufacturer lock or network lock can be made SIM free if the owner provides the IMEI number. However, barred, stolen and lost devices may not be eligible for an unlock.
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