wakeupcall.com or 1-800-wakeupcall

I would love to see a service that I could register at, that would place all call to my cellphone at a predefined time. And that would ring again in 5 minutes, and then again in 5 minutes, if no answer.

It could either be a paid service (2 bucks a month?) or paid for by making the wakeup call a paid ad (“Wake up! Have a good morning and drink Pepsi.”)