For professional repair shops, the term "iPhone 7 IMEI repair tool" often refers to sophisticated hardware boxes combined with powerful software. These are not apps you download on a phone but complete systems used to interface with a phone's internal components.
On an iPhone 7, the IMEI is hardcoded into the and paired cryptographically with the EEPROM chip and the Main A10 Fusion CPU . Why Traditional "IMEI Changers" Do Not Work on iOS