device identifiers

[Anuradha Mandava]

HI,

I need to tie the fire base token that gets  generated on the my app start up to a  device identifier like IMEI or MDN on user login into the app.  The app will be built using react native  for ios and android platforms.

is there a way to get the device identifiers in ios or android or what is the best way to approach this?

Thx