First we will talk about the Facebook flex. Facebook flex is allows you to use Facebook for free in a limited capacity.

In Pakistan two mobile services are offering this service i.e Telenor and Zong.  Here is the link for information regarding activating the service

For Telenor https://www.telenor.com.pk/facebook-flex

For Zong    https://www.zong.com.pk/internet/mobile-internet/internet-promotions/facebook-freebasics

What features you can access with Facebook Flex? 

• You can comment, share, like or tag someone in a Facebook status.
• You can view Facebook feed.
• You can message via Facebook messenger.
• You can send photos via Facebook messenger.

What features you cannot access with Facebook Flex?

• You cannot view, comment, share, like or tag someone in a Facebook photo.
• You cannot view, comment, share, like or tag someone in a Facebook video.

Who can use facebook flex?

• All active Telenor/Zong Prepaid subscribers with data capable phone can access Facebook Flex.
• Facebook Flex will be available free on Telenor and Zong network till further notice.

Conclusion :

It’s a good service but you cannot use facebook flex to watch videos and look at the galleries.