Through KYM, you can check the validity of your mobile device even before buying it with the use of International Mobile Equipment Identity (IMEI). You can get IMEI of a mobile device through any of following means:-
Written on the box of the mobile device.
Dialling *#06# on your phone.
By going in Settings > About > IMEI of the mobile device.
If the status of the mobile is shown as Black-listed, duplicate or already in use, please avoid buying the mobile device. KYM could be used through any of the following 3 methods.
SMS: Type KYM <15 digit IMEI number> from your mobile and send the SMS to 14422.