Cell phones as quarters or time cards?

From the CTIA Newswire: "Drivers lacking quarters in Coral Gables, Florida can now use their wireless phones to feed parking meters. The automated system allows drives to simply dial in from their wireless phones, enter the number assigned to their parking spot, and the required costs will be bill to their credit card. Subscribers call back and end the billing cycle when they leave. (Source: Associated Press)" - this one is a little odd - you have to "call back at the end of the billing cycle?" What if you forget? How do you know you've been overcharged? I wonder if you can specify the initial amount at the first phone call and then add more if necessary...

Also: "ECONZ Wireless product Timecard is a simple new tool available on Verizon Wireless phones that enhances productivity. Timecard allows remote employees to clock in and out using their wireless phones and then each entry is transmitted to a password-protected Web page accessed by employers to prepare payroll. Timecard is ideal for smaller companies whose employees would like to record their billable hours without resorting to payroll. The program costs $9.49 per month for each phone that comes equipped with it. (Source: Associated Press)"