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A Central Equipment Identity Register (CEIR) is a database of mobile equipment identifiers (IMEI – for networks of GSM standard, MEID – for networks of CDMA standard). Such an identifier is assigned to each SIM slot of the mobile device.
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.
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.
A virtual base transceiver station (VBTS) [5] is a device for identifying the temporary mobile subscriber identity (TMSI), international mobile subscriber identity (IMSI) of a nearby GSM mobile phone and intercepting its calls, some are even advanced enough to detect the international mobile equipment identity (IMEI).
Cam Ranh International Airport (IATA: CXR, ICAO: VVCR) is located on Cam Ranh Bay in Cam Ranh, a provincial city in Khánh Hòa province in Vietnam.It serves the city of Nha Trang, the capital of Khánh Hòa province, which is 30 km (16 NM) from the airport.
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.