On Facebook mobile, the Logout button is usually located on the bottom left corner of the page. If it is not their, then look on the homepage for it.
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Look at this site : https://support.skype.com/en/faq/FA10789/How-do-I-disconnect-my-account-from-Facebook?frompage=search&q=facebook&fromSearchFirstPage=false
It depends what type of phone you have
the answer would be in my pants! ;) lol its on the facebook website!
not on your phone bill.
Putting your phone number on Facebook is not a good thing to do. If you want to give your phone number to someone, you should give it to them directly. On Facebook, strangers can see your information and use it unwisely.