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If a phone has been factory unlocked, it can be reset or updated without any problem. Also if you put in a new sim card it will have no problems accepting that card.
For Samsung, simply open your Samsung’s phone app. Enter *#0*# using the dial pad, and the phone will immediately go into its secret diagnostic mode. Note that the process is automatic, so there’s no need to tap on the green call button to enter the command. So if you enter the code and nothing happens, the feature is disabled on your device.
For Iphones, the process can be conducted simply via installing free apps on Apple Appstore. To name some apps, they are Sensor Kinetics, Test and Check for Iphone. Also if a person checking these functions is a professional technician or a regular Apple product user, he or she won’t find it difficult to detect if the screen is an original one or a duplicate one. There are other small observations that can be made to check if the display is original or not by looking at the fonts and icons and color sharpness.
The batteries can be checked if its original or fake by looking for signs of poor quality on battery placement such as: inaccurate printing, misspelled wording, crooked label placement and signs of defective workmanship. Some mobile phone manufacturers also place hologram stickers on their batteries, which are difficult to replicate by counterfeiters – although they do try.
Also other points to be noted are the battery life or power of the phone, how fast the phone charge is draining and check if the phone has been repaired or not previously.