iPhone / iPad:

You can install the following VNC Clients from the Apple App Store:

1. Mocha VNC Lite Website

2. Jaadu VNC Website

Android:

(This application is available at the Google Marketplace as well)

Download

RIM Blackberry

This is a third-party application made for the Blackberry phones:

Download

Nokia Phones:

There are a variety of Nokia phones that are available in the market and are classified based on the operating system. Operating System: S60 3rd Edition, Feature Pack Available Phones: Nokia E51, E63, E66, E70, E71 - (2), E90
Nokia N76, N81, N82, N95.

Here is the website for the download and installation instructions:
Symbian VNC
Mobileways
P.I.P.S.

Operating System: S60 3rd Edition, Feature Pack 2
Available Phones: Nokia E52, E55, E72, E75
Nokia 5730 XpressMusic, Nokia E75, N96, N86, N79
Samsung GT-i8510, Samsung GT-i7110

Here is the website for the download and installation instructions:
Symbian VNC
Mobileways
P.I.P.S.

Operating System: S60 5th Ediiton
Available Phones: Nokia 5800 XpressMusic, Nokia 5800 Navigation Edition, Nokia 5530 XpressMusic, Nokia 5230, Nokia N97, Nokia N97 mini, Nokia X6, Samsung i8910 Omnia HD, Sony Ericsson Satio

Here is the website for the download and installation instructions:
Mobileways
RDM+

Palm (Pre / Pixi)

Download

Palm Instructions