Frequently used terminology and tips for iOS

IOS has many frequently used terms. Let's get to know each other.


ECID is the exclusive chip ID. The ECID of each hardware device is unique. The SHSH files of each generation are also different. In combination, each device has a unique verification data in each version of the system. To update the firmware and restore the firmware, you must connect to the ecs id of the official server to verify the firmware. backup ECID code and 00. the SHSH file cannot restore the existing JB firmware to prevent new baseband firmware from being released by Apple. therefore, this statement backs up the ECID code and 00. SHSH file, ''one jailbreak, a lifetime Jailbreak! ''


Serial No. The serial number is a string of Information that identifies your mobile phone birth certificate and body characteristics, and can even be used to identify whether it is an official refurbished machine.

You can simply divide this string of numbers into the aabccdddeef format.

1st or 2-digit (AA) indicates the manufacturing factory code of the mobile phone.

3rd bits (B) indicates the production year of the mobile phone.

4th or 5 bits (CC) indicates the number of mobile phone production weeks.

6th, 7, and 8-digit (DDD) are unique identifiers, and each mobile phone is different.

9th, 10 (EE), which is represented by mobile phone color according to foreign forums.

11th bits (f) indicates the mobile phone capacity according to foreign forums.


A udid is a string of 40 letters and numbers. Its full name is "unique device identifier description". Each iPhone has a unique udid number. For users, udid is used in one place. As we all know, iPhone applications need to be downloaded through the App Store.


IMEI stands for "International Mobile Equipment Identity number 」. International Mobile Equipment identification code (IMEI), which is generally called the mobile phone serial number, is used to identify each independent mobile phone in the mobile phone network, it is an internationally recognized mobile phone number, which is equivalent to a mobile phone ID card. The sequence number consists of 15 digits. The first six digits (TAC) are the model approval numbers, representing the mobile phone type. The next two digits (FAC) are the final assembly number, representing the origin. The last 6 bits (SNR) are serial numbers, representing the production sequence number. The last 1-digit (SP) is generally 0, which is the Verification Code and is used for backup. The identification codes of International Mobile devices are usually attached to the back of the fuselage and the outer packing, and also exist in the mobile phone memory. You can enter * #06 # To check the codes.
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The full name of iccid is "integrate circuit card identity ".
The ID of the SIM card that is inserted in the iPhone. By inserting SIM cards of different carriers, different iccids are generated.

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