I've downloaded an application that wasn't in Google Play (private developer) for testing purposed. Part of the assignment is for me to send them back some information about my device (auto-generated, I just hit send). However, I noticed before sending the email that there was an attachment. I sent it to myself first so I could look at it on my computer and saw it was all of my contacts and the information I had of them, such as phone numbers, names, etc.
Is this something the developer legitly needs? The application can call other people, so that may be why they need it, but I don't understand why they need it. Should I send it to them?