iPhone: setting – cellular mobile network -SIM card application – OTA -sim-reactivation
Samsung mobile phone: Desktop -Joytel icon -OTA- sim-reactivation
Huawei mobile phone: desktop – utilities -SIM card application OTA -sim-reactivation
OPPO mobile phone: Settings -SIM card application -OTA- sim-reactivation
Mi/redmi mobile phone: desktop-system tool-usim card tool-OTA -sim-reactivation