IMEI-SV stands for International Mobile Equipment Identity - Software Version. It is a 16-digit code that identifies the mobile phone and the version of its software. The IMEI-SV differs from the regular IMEI in that it has a 16-digit long code, where the last two digits identify the software/firmware version (SV). This parameter is used by the manufacturer to send the appropriate software version to the device when the latest software version is released.

To check the IMEI-SV number on an Android 9.0 device, you can go to Settings > System > About phone > IMEI. Alternatively, you can use the dialpad and enter *#06# to display the IMEI-SV number. The IMEI-SV can also be found in the device settings.

The IMEI-SV is part of the International Mobile Equipment Identity (IMEI), which is a numeric identifier for mobile phones. The IMEI includes information on the origin, model, and serial number of the device. The structure of the IMEI/SV is specified in 3GPP TS 23.003. The IMEI/SV is usually found printed inside the device and can also be found on the devices packaging or under the battery cover.