Apr 23, 2020 · Remove the target phone’s SIM card and note down its IMSI code. Insert the SM card reader into the SIM slot to retrieve a unique authentication code. Connect the original SIM to the SIM card reader and connect it to the PC.
The IMSI is stored on the phone USIM card and identifies your subscription to the operator, whilst the MSISDN (mobile phone number) is the public part of the mapping You can get the IMSI number in a number of ways 1) it may be printed on the SIM card, 2) it will have been written on paper when you got the phone subscription.