How to store form items in mobile joomla?

Hi,

I want to create a form page(may be HTML) in MJ where i will enter few form data. Now, how do i store these details in the database?? Do i have to write php code for it?? if so, how??

There are a lot of extensions to easily make forms in joomla (extensions.joomla.org/extensions/contacts-and-feedback/forms), but I've never test them on mobile phone.

how database interaction in Mj is handled is what i exactly wanted to know!

MJ is extension for Joomla and it doesn't affect joomla's database interaction (it just change template and does some page postprocessing like image rescaling etc.).