Yes. Various application stores have a free twitter app, without advertisements.
You can access Twitter on any mobile device through Twitter Mobile or Mobile Internet.
A computer is the main device used for Twitter. However, mobile phones such as iPhones have a down loadable application that allows you to Tweet from your mobile phone.
yes
Either a computer/laptop or a mobile phone.
yees
Yes. You can either download the free app from the app store or visit the mobile twitter website.
A Hands-free device is usually paired with a mobile phone via bluetooth.
You can access Twitter through Mobile Twitter or Mobile Internet.
Yes it's free. If you mean to use on a mobile phone then it depends on your provider and their charges.
Joining Twitter is free. As for mobile charges, it depends on your provider and your mobile plan. You should contact your provider to find out what you are and aren't charged for.
You can use Twitter Mobile or Mobile Internet.
No