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2. International Mobile Equipment Identity - Wikipedia

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

   To make blocklisting effective, the IMEI number is supposed to be difficult to change. However, a phone's IMEI may be easy to change with special tools. [10] [better source needed] In addition, IMEI is an un-authenticated mobile identifier (as opposed to IMSI, which is routinely authenticated by home and serving mobile networks.) Using a ...

3. SIM lock - Wikipedia

   en.wikipedia.org/wiki/SIM_lock

   On recent phone models running Android software, the phone will display a message saying "SIM network unlock PIN" or "Enter Network Lock Control Key" if network locked. Windows phones will display the message, "This SIM card can only be used on specific networks. Contact your customer service center for the unlock code".

4. Type Allocation Code - Wikipedia

   en.wikipedia.org/wiki/Type_Allocation_Code

   The Type Allocation Code (TAC) is the initial eight-digit portion of the 15-digit IMEI and 16-digit IMEISV codes used to uniquely identify wireless devices.. The Type Allocation Code identifies a particular model (and often revision) of wireless telephone for use on a GSM, UMTS, LTE, 5G NR, iDEN, Iridium or other IMEI-employing wireless network.

5. Get 24x7 Live Tech Support for Any Device | AOL

   www.aol.com/products/tech-support

   24x7 support for your AOL account issues plus security products. Learn more ; Unlimited tech support for nearly any issue on any device. Learn more

6. SIM card - Wikipedia

   en.wikipedia.org/wiki/SIM_card

   A typical SIM card (mini-SIM with micro-SIM cutout) A SIM card or SIM (Subscriber Identity Module) 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 devices (such as mobile phones and laptops).

7. 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 ...