Please consider a 7-10 second "no charge" on calls. My young daughter racks up a lot of 1 minute charges for calls that go to voicemail to the numbers she calls (mainly her mom or myself). She isn't actually speaking to anyone or leaving a message but I guess the system picks up a "connection" thus charging for the call. Most of the charges are for 6 or 7 seconds (the duration of the voicemail message) but it's charged on my bill a full minute. 4 or 5 calls in the matter of a couple minutes, 5 days a weeks starts to add up.