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  2. GPS satellite blocks - Wikipedia

    en.wikipedia.org/wiki/GPS_satellite_blocks

    The Block IIA satellites were slightly improved versions of the Block II series, designed to provide 180 days of operation without contact from the control segment. However, the mass increased to 1,816 kg (4,004 lb). [9] Nineteen satellites in the Block IIA series were launched, the first on 26 November 1990 and the last on 6 November 1997.

  3. GPS Block IIF - Wikipedia

    en.wikipedia.org/wiki/GPS_Block_IIF

    The satellites supplement and partially replace the GPS Block IIA satellites that were launched between 1990 and 1997 with a design life of 7.5 years. [3] The final satellite of the Block IIA series was decommissioned on 09 October 2019. [4] The operational constellation now includes Block IIR, IIRM, IIF and III variants.

  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 ...

  5. List of Apple codenames - Wikipedia

    en.wikipedia.org/wiki/List_of_Apple_codenames

    This list of Apple codenames covers the codenames given to products by Apple Inc. during development. The codenames are often used internally only, normally to maintain the secrecy of the project.

  6. GPS Block III - Wikipedia

    en.wikipedia.org/wiki/GPS_Block_III

    Implementation will provide C/A code to ensure backward compatibility. Assured of 1.5 dB increase in minimum C/A code power to mitigate any noise floor increase. Non-data signal component contains a pilot carrier to improve tracking. Enables greater civil interoperability with Galileo L1. It is defined in IS-GPS-800. [55]

  7. List of transponder codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Transponder_Codes

    Instrument Flight Rules (IFR) flight below 18,000 ft ASL when no other code has been assigned. [7] ICAO: Non-discrete mode A code reserved use in mode S radar/ADS-B environment where the aircraft identification will be used to correlate the flight plan instead of the mode A code. [1] US: Used exclusively by ADS-B aircraft to inhibit mode 3A ...

  8. SIM lock - Wikipedia

    en.wikipedia.org/wiki/SIM_lock

    The unlock codes retrieved must be entered into the mobile phone using the keypad. For DCT4 and DCT3 Nokia, unlock codes consist of a "#" key, followed by "pw+", 10 (DCT3) or 15 (DCT4) digits, "+", and another number ranging from 1-7, and finally ends with a "#". Depending on the carrier which the phone is locked to, only some codes will work ...

  9. iPhone hardware - Wikipedia

    en.wikipedia.org/wiki/IPhone_hardware

    The top and side of an iPhone 5S, externally identical to the SE (2016).From left to right, sides: wake/sleep button, silence switch, volume up, and volume down. The touchscreen on the iPhone has increased in size several times over the years, from 3.5 inches on the original iPhone to iPhone 4S, to the current 6.1 and 6.7 inches on the iPhone 14 and 14 Pro series. [1]