I want that user can post on my android app (on a discussion) without registration. But I also want to make an identification of the post, who posts the post. I thought I will save user's phone's IMEI no to identify him. So that I can show his post to him (on my posts section).
Is it safe to use IMEI? Or is there any way to do my work successfully. I want to add that I will save the post to my web server.