A new device reminds drivers when a car payment is due. And if they don't pay up, they're not going anywhere.--- ST. PETERSBURG - One of life's cruel quirks got Amber Jumbelick into trouble. When the 23-year-old waitress had her first child, she began paying expenses by credit card. Then she lost her job and her ability to pay bills. Her credit tanked. "I needed a car, but my credit was so bad nobody would give me a loan," Jumbelick said. "I'm a waitress and a single mom with a baby boy. I don't have extra money to put away."...