Re: To my cell phone?
There isn't a single-click solution, but if your phone is email enabled and checks periodically for new messages, this should work.
Go to the UserCP and set "Thread Subscription Mode" to Instant Email Notification. If necessary, go into "Edit Your Details", then Click on the "Edit Email & Password" button.
Set your email address to that of your phone. So, when someone replies to a thread that you have subscribed to, the software will send an email to your phone.