Morning @Hossain1471
Thanks for coming here.
To report the SIM as lost, you would need to call us on +44 7953966250, and select the option for lost and stolen.
Our Mobile Care team will block the phone and SIM card for you and send you a replacement SIM card with the same number.
Please see our What should I do if my phone is lost or stolen? Help page for more details.
Leanne.
