Facebook Security code

Okay so. I have that security code thing on my Facebook . So when I log into fb with another device i have to put in a code that's send to the number on my Facebook. Okay well I don't have that number anymore. And that's the only number that gets the code. So how can I get into my Facebook again ? Like is there any way to some how take off the security code without logging in or get in without the code?
Please answer. I'm in For desperateeeee help.
- thank you. (: