There's a nice app for Android that I have been using for a few weeks. It works very well and I think it's usefull. It allows you to control BOINC from your smartphone.

There's wiki about the app, and here you can see some Screenshots to see how it looks like from your phone.

So this How To is going to be really simple... It's already done!
How to setup Androboinc
BOINC Setup Linux
BOINC Setup MacOSX
BOINC Setup Windows
Take specially care at Firewall configuration, put a nice password to protect it and don't forget -allow_remote_gui_rpc !!

You can see the full explanation on how this work on Controlling BOINC remotely