Nowadays in the world people daily buy thousands handphones. Usually nobody reads manuals so very often people do not know about whole potential of their
brand new handphones. Most people know that using a handphone they can make calls, send messages, shoot pictures with built-in camera and go online. Much less people know that they also can install extra software such as games, applications along with themes. Handphone themes are what I would tell you about in this article.

Handphone theme is a special file which includes a set of pictures, icons and sometimes ringtones. Handphone themes are used to decorate and personalize your handphone, change fonts size and colors to make texts and labels more readable and convenient.
Themes for Nokia handphones are files with .sis or .nth extension. Sis files are used for handphones based on S60 platform (which includes such handphones as Nokia 6600, 6630, 3250, N76 and other). Nth files are used for handphones based on S40 platform (such as Nokia 6230i, 6300, 6125 and so on).

There are a lot of websites where you can buy quite different handphone themes, but also there are some websites where quality handphone themes are downloadable for free. You can select your handphone and desired category and download handphone themes absolutely free, without registration or whatever.
After that you need to transfer theme file to your handphone. You can do this over Bluetooth or infrared port or copy the file onto your phone’s memory card with a USB card reader. When a theme is transferred into your handphone you can install it as software if using S60 handphone or simply select it from gallery and apply on S40.
Source : Andrew Sekachev