I could not log on to facebook from my iphone or other browsers on my iphone

I recently changed my password from my laptop due to possible security breach. But when I tried that password on my iPhone it doesn’t let me to login on facebook app and browsers on my iPhone. When I reset my password from my iPhone and try to login in from the lapton. It says that the password is incorrect. It is cyclic. I have already updated my iOS. I try resetting privacy, location, network setting, reset all setting. I have deleted and reinstalled the app. I tried changing time setting. But none of the technique work.How can I log on to my fb account from my iPhone?? What can I do? Thank you in advance, looking forward for a reply with solution.