Good question, @DL! Which community site are you referring to?
The link that @VarunGrazitti posted is referencing Mobile V2, a product that we are not activating on customer sites any more.
That said, there are two possibilities of what you might be seeing depending on what you have activated. I am going to assume the 'predictive text' you are referring to is in one of your community search boxes.
If you are looking at our original mobile offering (this needs to be configured) you will not see suggestions from the community as you type. You would know if it is turned on because the experience is drastically different from desktop.
If mobile is not configured, you will see the desktop version of the site, and the search suggestions will still show up even though you are on a mobile device.
If you have our mobile experience turned on (the community looks completely different when you access from mobile) you will not be able to see predictive text or be able to move/edit posts. Those features aren't supported in that mobile version.
That said, we will be rolling out our responsive skin in a few months that we announced at LiNC in June. Rather than being a separate site, this is a skin that layers on top of your desktop site. That means you will have access to all of the features you are used to, incuding predictave text and admin actions such as move and edit (as well as a lot more!).
For more details about how you can learn about the Responsive Skin or get on an early beta, reach out to your Lithium Community Representative.