It is connected with the business model of Apple. Under the contract, the operator is obliged to deduct a certain percentage of the revenue from the subscriber Apple. Do not know for sure how many, but there are rumors that up to 20%. In this connection, you can use phone with only SIM-card the above statements. And nothing else. The scheme for "legal" iPhone user is as follows: In the company store operator or purchased at the Apple Store phone subscriber gets home and online contract with the operator after the conclusion of the contract, after a while the phone is activated and can be used therefore to the unit earned in the network of any other operator follow these steps: Enable workaround for checking phone SIM card first step, as expected, is called activation. Its essence lies in the fact that access to basic features of the phone. The second step is called unlocking, in the world – unlock.
What is unlock? Unlock – a modification of the software GSM-module, which allows the use of iPhone, a phone with a SIM card of any operator. There several methods: software (soft unlock) – when, without interference in the hardware of the phone is modified radio modem, a cleaning validation for the SIM card belonging to the operator. Usually used for this program AnySim (iUnlock) or iPhoneSimFree. How does this process in detail, please read the section: "Bootloader, secpack, OTB, and all-all-all." Hardware (hard unlock) – when the phone is opened and through closure of Test Point get access to the modification of the software part radio modem.