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2. SIM card - Wikipedia

   en.wikipedia.org/wiki/SIM_card

   A typical SIM card (mini-SIM with micro-SIM cutout) T-Mobile nano-SIM card with NFC capabilities in the SIM tray of an iPhone 6s cell phone A SIM (Subscriber Identity Module) card is an integrated circuit (IC) intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephone ...

3. List of iPhone models - Wikipedia

   en.wikipedia.org/wiki/List_of_iPhone_models

   The iPhone, developed by Apple Inc., is a line of smartphones that combine a mobile phone, digital camera, personal computer, and music player into one device. Introduced by then-CEO Steve Jobs on January 9, 2007, the iPhone revolutionized the mobile phone industry with its multi-touch interface and lack of physical keyboard.

4. iPhone 4 - Wikipedia

   en.wikipedia.org/wiki/IPhone_4

   An iPhone 4 A1332 with a micro-SIM card removed with a paper clip, showing its SIM card compartment. The GSM iPhone 4 uses a micro-SIM card, which is positioned in an ejectable tray, located on the right side of the device. The CDMA iPhone 4, however, the phone connects to the network using an ESN. All prior models have used regular mini-SIM ...

5. Personal unblocking key - Wikipedia

   en.wikipedia.org/wiki/Personal_unblocking_key

   If the wrong PIN is entered more than three times, the SIM card will become locked. It can be unlocked by entering the PUK code provided by the mobile service provider, [1] which may be available on the SIM card's packaging, the contract, or provided by customer service after identity verification. After the PUK code is entered, the PIN must be ...

6. UDID - Wikipedia

   en.wikipedia.org/wiki/UDID

   This also holds the Find My Activation Lock status. Starting from iOS 11 , Apple's verification server will check the device's UDID before it could be set up. If the device's UDID is malformed or not present in Apple's database, the device cannot be activated and will be denied access to the verification server.

7. Add or disable 2-step verification for extra security - AOL Help

   help.aol.com/articles/2-step-verification...

   4. Select Authenticator app for your 2-step verification method.-To see this option, you'll need to have at least 2 recovery methods on your account . 5. Click Continue. 6. Scan the QR code using your authenticator app. 7. Click Continue. 8. Enter the code shown in your authenticator app. 9. Click Done. Sign in with 2-step for authenticator app. 1.

8. 2-Step Verification with a Security Key - AOL Help

   help.aol.com/articles/2-step-verification-with-a...

   Sign in and go to the AOL Account security page.; Under "2-Step Verification," click Turn on.; Click Security Key.; Follow the onscreen steps to add your Security Key. Add additional recovery methods in case your Security Key is lost.

9. International mobile subscriber identity - Wikipedia

   en.wikipedia.org/wiki/International_Mobile...

   The international mobile subscriber identity (IMSI; / ˈ ɪ m z iː /) is a number that uniquely identifies every user of a cellular network. [1] It is stored as a 64-bit field and is sent by the mobile device to the network.