Wake up calls for phones?

Sean was looking for a service that would automatically call his phone with a text to speech message at a specified time “I would like to be able to program my computer to call my cell phone or a regular phone with text to voice messages–eg reminders, important appointments or wake up calls and for pranksters…The catch is that the other person should not require the same software to receive the call. Anybody know of any software that does this univocally?” I found a web service that does this (some free and some fee) here. I usually use my built in alarm clock on my phone, but it doesn’t of course talk to me or call anyone else.