How do I find and or track my stolen Samsung Galaxy s3? Can I find it by using another Samsung Galaxy s3?
if you have dropbox
How to Use Dropbox to Track and Locate Your Stolen Laptop
It depends on if you had anything setup or installed that can help with locating the phone. There are options built into the device that could have been setup, or you could have installed an antivirus with phone locator capabilities, such as Lookout Mobile security. If you haven't or don't know if you setup/installed any apps like these, go the the Play Store online and install the Plan B app by Lookout Mobile through the web browser.
Log into the Play Store with the Google account used on your phone, download abd install the app to the Galaxy S3, and then follow the instructions in the app description as well as check your email for updates on the location of the phone. Note: as time goes by, the slimmer the chances of funding the phone, and even using such services for locating the phone. If you don't think you can find the find in a reasonable time, you may want to call the phone service provider and have them blacklist the IMEI number of your phone (may be difficult if you do not have the IMEI number or other information that would help in identifying the IMEI number). Good luck