I used Google's Find My Phone to factory reset my phone since I lost it but before that happened, I got my phone back
If you reset your phone using the Android Device Manager, there's a good chance it's already gone. Online means connected to the internet, and if mobile data was still on while you clicked the erase button, there's no way to undo that, as far as I know. Luckily, you can still recover some data when you sign in to your Google account on your phone, namely apps, settings and maybe some photos (if you used Google Photos).