Free app:
http://itunes.apple.com/us/app/camviewer-for-foscam-webcams/id416551665?mt=8  

Other app:
http://itunes.apple.com/us/app/foscamviewer/id389966111?mt=8
http://itunes.apple.com/us/app/homewatch/id332703885?mt=8
http://itunes.apple.com/us/app/smart-control-foscam-edition/id390165453?mt=8  
http://itunes.apple.com/us/app/foscam-ip-control/id348726919?mt=8
http://itunes.apple.com/us/app/foscam-surveillance/id373509500?mt=8
http://itunes.apple.com/us/app/ipcam-fc/id548480721?mt=8

For Blackberry:
http://totalcontrolapp.com/index.php?option=com_content&task=view&id=42&Itemid=66
www.mobiscope.com  

For Android:
http://totalcontrolapp.com/index.php?option=com_content&task=view&id=47&Itemid=84
http://www.androidzoom.com/android_applications/tools/ip-cam-viewer-lite_cwi.html  

2) Some mobile phone with Windows Mobile system or Symbian system which support JAVA can install the mobile player software in CD. It is used to view video of the camera. Make sure that your mobile phone support RTSP.

3) If your mobile phone can’t view living video after install the mobile player and set all the settings successfully, you can use CGI commands to view snapshots. For example:

http://cameraip:port/snapshot.cgi?user=XXX&pwd=XXX  
(such as: htttp://183.125.93.67:86/snapshot.cgi?user=admin&pwd=123 or
http://foscamdemo.dyndns.org:88/snapshot.cgi?user=admin&pwd=admin  )
Type in these urls in the browser and you will see snapshot of the camera, if you want to view the current snapshot, just refresh the browser frequently.
This way is better for many mobile phone according the network speed on phone.

4) If you install the mobile player software, but still cannot view living video, it may due to that your phone does not support RTSP, you can download a player that support RTSP, such as Coreplayer and install it on your phone to achieve that.

Put the urls http://cameraip:port/videostream.cgi?user=XXX&pwd=XXX  as its address in the Coreplayer and you can get living video.