From the beginning, you can get the number from your profile url by clicking click on the “Profile” tab in the upper right hand corner:
It’s something likes:
Use Facebook Graph API
After logged in to your Facebook account, copy and paste the url below associate with your facebook username:
Replace your_user_name with your current Facebook username, if you have already customize your Facebook Profile URL.
Example, my Facebook username is hoanhuynhtrong, so simply access the url below, after logged in successful – of cause, I will get my current number and maybe some extra information (name, first_name, last_name, link, gender, locale, …):
The responses are in JSON format but it’s easy for us to find current Facebook ID is: