Samsung - no longer able to use Facebook Free Mode

I have a Galaxy J1 mini prime and have been using Facebook's 'Free Mode'. But I am no long able to use that option and it goes straight to the mobile data usage. If there some setting I have inadvertently changed?
Thanks in advance

from Android Forums at AndroidCentral.com - Ask a Question http://ift.tt/2eTYVIv
via IFTTT