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  2. UAN - Wikipedia

    en.wikipedia.org/wiki/UAN

    The combination of urea and ammonium nitrate has an extremely low critical relative humidity (18% at 30 °C) and can therefore only be used in liquid fertilizers. The most commonly used grade of these fertilizer solutions is UAN 32.0.0 (32%N) known as UN32 or UN-32, which consists of 45% ammonium nitrate, 35% urea and only 20% water. Other ...

  3. Supplementary service codes - Wikipedia

    en.wikipedia.org/wiki/Supplementary_service_codes

    ETSI and 3rd Generation Partnership Project (3GPP) standards, such as GSM and LTE, define supplementary service codes that make it possible to query and set certain service parameters (e.g., call forwarding) directly from mobile devices.

  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 mobile virtual network operators in the United States

    en.wikipedia.org/wiki/List_of_mobile_virtual...

    Apple eSIM supported Worldwide Service Provider [613] Truphone: T-Mobile: GSM & UMTS: Apple eSIM supported Worldwide Service Provider [613] Ubigi: Various: Various: Apple/Android/Windows and Connected Car eSIM Supported. Pronounced You-bee-gee. Subsidiary of Transatel. Operates on MNC 901-37. /> Saily Various 4G/5G

  6. Unstructured Supplementary Service Data - Wikipedia

    en.wikipedia.org/wiki/Unstructured_Supplementary...

    The user submits a code corresponding to the service available. USSD can be used to provide independent calling services such as a callback service (to reduce phone charges while roaming), enhance mobile marketing capabilities or interactive data services. USSD is commonly used by prepaid GSM cellular phones to query the available balance.

  7. Network equipment provider - Wikipedia

    en.wikipedia.org/wiki/Network_equipment_provider

    This is a highly competitive industry that includes telephone, cable, and data services segments. [3] Products and services include: Mobile networks like GSM (Global System for Mobile Communication), Enhanced Data Rates for GSM Evolution (EDGE) or GPRS (General Packet Radio Service). Networks of this kind are typically also known as 2G and 2.5G ...

  8. Least-cost routing - Wikipedia

    en.wikipedia.org/wiki/Least-cost_routing

    Mobile number portability (MNP) is a service that makes it possible for subscribers to keep their existing mobile phone number when changing the service provider (or mobile operator). With number portability now in place in many countries, LCR providers can no longer rely on using only a portion of the dialed telephone number to route a call.

  9. Personal communications service (NANP) - Wikipedia

    en.wikipedia.org/wiki/Personal_communications...

    An initial service concept was that customers could move a given seven-digit telephone number when relocating between numbering plan areas. The 500-code would thus be a non-geographic area code. In 1995, AT&T introduced a "follow-me" service under the brand name of AT&T True Connections using area code 500.