We have created some free tools which can be used from most internet enabled mobile phones and handheld devices.
If you have an older device with only limited web functionality, then you can often improve the experience by first installing the free Opera Mini browser on it.
See http://www.opera.com/mini/ for all further details and installation of Opera Mini.

Mobile Four Pillars Calculator

Version 1 (for older phones) : http://www.fourpillars.net/mob4p.php

Version 2 (improved graphics): http://www.fourpillars.net/ipod4p.php

Just try which version works best on your device, then bookmark the page for later use.
With Opera Mini installed it is very likely you will be able to use the Version 2.

Mobile Feng Shui Calculator

Calculate Flying Stars charts , with or without Replacements Stars:
http://www.fourpillars.net/mobfs.php

Mobile Nine Star Ki Calculator

Calculate Nine Star Ki chart and Ming Gua Number:
http://www.fourpillars.net/mob9ki.php