A free program for Android, by DevAppliance.

IMEI Generator is an application that can be used to generate IMEI numbers for various phones and devices. The purpose of this application is to make it very easy to generate Imei numbers for your phone or device. This is done by providing you with an interface that is very easy to use. 

Please note, the app isn’t an IMEI changer. It only helps you generate IMEI numbers for your device or any other device. Also, it can verify if the IMEI is correct and check the device where it belongs with 100% accuracy.