Open the Phone app
Dial `*#06#` to check the IMEI number
Dial `*#*#4636#*#*` to open testing information on some Vivo phones
Dial `*#0000#` to view device model and software info on some Vivo phones
Dial `*#*#4838#*#*` to open phone information on some Vivo phones
Check the model code in Settings > About phone
Compare the model code with Vivo’s official model list
Check the label on the phone box or SIM tray for the model number