A kilobyte is a unit for measuring the amount of data sent over a network. The billing system measures the amount of data sent and received and rounds it up to the next higher kilobyte value at the end of the session. You are not charged for the time connected but for the amount of data sent back and forth. So you will be billed for at least 1 kilobyte each time you connect. Some activities which could use data include checking email, downloading games or ringtones or connecting to the internet through the phone. At the pay per use rate each kilobyte sent or received costs $0.01. So a usage of 176 kilobytes would cost $1.76. Be advised that there is a two to four day delay in displaying data usage. Consequently your data usage might be even higher than what you see online. Review your phone usage to make sure that you are not doing things to use data by mistake. If these activities are intentionally, one could run up a hefty bill at the pay per use rate. Depending upon your phone model, some of these data sessions might have been initiated by the phone automatically. Some automatic activity could include checking email, checking stock prices, checking weather or checking sports scores.
