FINALLY !
Ever since Ive got mi first iPhone (2G, 8gb), I desperately needed a feature similar to the one I used to have on my old sony ericsson Z600, that beeped each minute of conversation. This app is the next best thing ! Ive got a call plan, that the first 5 minutes (4.30 to be precise) are free of charge to a predefined list number. This app helps me to avoid crossing that 5 minute limit =), so it pays itself !!
Saulopez about
Call+Data Time Monitor, v4.6