To download the insta7 app to your mobile phone, you can go to http://insta7.com/d.aspx
When you click the app icon, it loads insta7 instantly in your phone's browser. Its a simple quick-launcher.
No! The app is just to make the access of insta7 faster and easier for you. However, if you do not wish to download the app, you can simply go to http://insta7.com from your phone's broswer.
NOTE: It is recommended that you activate a monthly GPRS (internet browsing) pack for your phone. Most service providers in India offer GRPS packs at barely Rs.100 per month. To know more about GPRS & GPRS packs check the FAQ page.