Cannot reach any SSL cloudflare site from Entel PCS chile (mobile)

Not even https://cdnjs.Cloudflare.com is reacheable via this particular mobile network.

Any ideas what could it be or what we could change to be able to use the sites again?

It appears we have noted an issue in Chile which may be the cause. You can monitor the status of the issue here: https://www.cloudflarestatus.com/