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To avoid confusion the database of GSM Association was renamed to IMEI Database - IMEI DB [1] (it was in 2003-2008, see “Document History” at IMEI Database File Format Specification [2]). Also sometimes a common IMEI database for several EIRs is called SEIR (Shared EIR). In each country, the CEIR can interact with IMEI DB differently.
The last number of the IMEI is a check digit, calculated using the Luhn algorithm, as defined in the IMEI Allocation and Approval Guidelines: The Check Digit shall be calculated according to Luhn formula (ISO/IEC 7812). (See GSM 02.16 / 3GPP 22.016). The Check Digit is a function of all other digits in the IMEI.
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.
Cần Thơ, anglicized as Can Tho or Cantho, is the fourth-largest city in Vietnam, and the largest city along the Mekong Delta region in Vietnam. [ 7 ] [ 8 ] It is noted for its floating markets , rice paper -making village, and picturesque rural canals . [ 8 ]
An IMSI is usually presented as a 15-digit number but can be shorter. For example, MTN South Africa's old IMSIs that are still in use in the market are 14 digits long. The first 3 digits represent the mobile country code (MCC), which is followed by the mobile network code (MNC), either 2-digit (European standard) or 3-digit (North American ...
Land line phone numbers in Vietnam follow the format Area Code + Phone Number.The area codes depend on the province and/or city. To dial a number within the same province or city, only the phone number needs to be dialed.
Below is a table listing the postal codes and telephone area codes in Vietnam (according to Vietnam Post, under the VNPOST corporation). Note: The provinces and cities are listed in order from North to South, and the centrally-governed cities are highlighted in bold.
Can Tho International Airport [1] (IATA: VCA, ICAO: VVCT) — formerly Trà Nóc Airport — is an international airport located in Can Tho in Mekong Delta region of Vietnam. The airport was inaugurated on January 1, 2011 and received US$ 150 million to build on 20,750 square metres (223,400 sq ft) of land.