Never throw away an iPhone 7 with a blank IMEI. The repair is possible. Whether you use a free utility like 3uTools or invest in professional Z3X hardware, the solution is out there. Just remember: Respect the IMEI—it is your phone’s digital fingerprint. Repair it, don't steal it.
Here are some of the most popular and effective iPhone 7 IMEI repair tools: iphone 7 imei repair tool
: if you simply want to use a different SIM card, contact your carrier to request an official unlock. Are you experiencing a specific "No Service" error on your iPhone 7, or are you trying to unlock the device for a different carrier? Never throw away an iPhone 7 with a blank IMEI