Depending on the model and production date, Apple iPhones can be flashed to different versions of the iOS operating system. Earlier, when the company's first device, the iPhone 2G, appeared on the market, it was possible to recognize the firmware by the sticker on the box right in the store.
Instructions
Step 1
Four years have passed since then, and so that hackers cannot find out the firmware version for its subsequent downgrade, the sticker on the box is encrypted. Therefore, you can find out the version of the iPhone 3GS and iPhone 4 only after purchasing and activating the phone through iTunes. Previously, it was also possible to recognize the firmware without activating the device by using a USSD request. On new Apple communicators, this feature is also disabled. If you want to determine the version of the operating system, after activating the phone, find the gray “Settings” icon on the iPhone desktop and touch it. In the window that opens, select the item "General", then - the sub-item "About the device." Here you will see information about the firmware version ("Version" line), the version of the modem's firmware, IMEI and other information. The higher the level of your firmware, the more possibilities the phone has. Firmwares of the 4th (4.3.4 - the last) and 5th generations are considered relevant.
Step 2
If you want to determine the unlock firmware when the phone is brought from another country, it is enough to put a SIM card of a Russian operator. If the phone complains that the operator is not supported and asks to insert a SIM card from another mobile operator, for example AT&T, then this means that your iPhone is locked. In other cases, the communicator is unlocked or simply not tied to a cellular network and is ready for use.
Step 3
Also, many iPhone users have questions about the jailbreak on their phones, especially after buying the device from their hands. You can check if the jailbreak is done as follows: find the brown “Cydia” icon on the screen and click on it. If the application is loaded, it means that the device already has a built-in jailbreak. Cydia requires an internet connection to work. Many users check iPhone for jailbreak or non-jailbreak by trying to install jailbroken apps through iTunes on their computer. This is wrong, because a game or program may not install even on a jailbroken iPhone if the AppSync package has not been installed from Cydia.
