You can write articles on communication techniques or technology. But such article should not be for advertising or promoting any particular manufacturer or particular product. 

Hmmm.... That's okay. Any kind of advertising should not be tolerated.. But I guess I can review latest gadgets that doesn't sound like advertising... Is it?

As long as you don't promote or advertise some gadget, there would be no problem. 

I think that ''review'' section is closed by admin recently.  But you can still write it in ''article section''.

But I don't know how it will work now. In past reviewing gadgets was only points earning. But what now? Suppose I am reviewing some smart phone, will I get cash credit or what?

Why don't you try from the Administrator through Contact us ? Your query has been answered by one of the senior moderators and editors in the earlier thread by Gulshanji.

Here on forum we can ask questions too. We have category of help, so I guess there is no prob.

There is no problem. But your query has been resolved by the concerned authorities.

Yes.. Moderators are here to help and they are doing fine job.. all of them.

Just want to ask another thing that as review section is no more will I get cash credit for reviewing smart phones. I mean in past I guess only points were available in review section.

Have a direct contact with Maveric through "contact us". All your doubts can be cleared.