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The Military Industry and Telecoms Group (Vietnamese: Tập đoàn Công nghiệp - Viễn thông Quân đội, lit. 'the Army Industry - Telecommunications Group'), [3] [4] trading as Viettel or Viettel Group (Tập đoàn Viettel), is a Vietnamese state-owned multinational telecommunications, technology and manufacturing conglomerate headquartered in Hanoi, Vietnam.
An eSIM (embedded SIM) is a form of SIM card that is embedded directly into a device as software installed onto a eUICC chip. First released in March 2016, eSIM is a global specification by the GSMA that enables remote SIM provisioning ; end-users can change mobile network operators without the need to physically swap a SIM from the device.
Example: users may dial old or new network code 0986888888 to Viettel. Maintain the notification sound (since the time of simultaneous dialing closes). During this time, any call using new network codes shall be normally processed and any call using old network codes shall be routed to the notification sound.