1. Go to Settings > Mobile network settings > Access Point Names.2. Now create an new Access Point Name.
3. The only two fields that are required to fill up are "Name" and "APN" fields. Write anything you want, it doesn't matter.
4. Fill them and save the new APN you just created.

Now enable mobile data connection and see if you are receiving any net connection.

The below image shows you how to do Dhiraagu MMS and Internet settings manually. Find the appropriate places and just fill 'em in ☺

And FYI, its a screenshot I took from some website couple months back, but I don't remember where I took it from. So, no referencing and credit awarding :p