WEX CardControl is a free iPhone app developed by WEX Inc. that provides EFS or Fleet One cardholders with the ability to manage their cards anytime, anywhere. Designed with drivers in mind, this app allows users to check card balances, review transaction history, and find fuel prices and accepting locations near them or along their route.

With WEX CardControl, drivers can also register checks, generate a dynamic PIN for ATM transactions, manage SmartFunds®, and transfer funds to external bank accounts. This app requires a valid and active card number and password/PIN to access these features. However, some features may not be available in certain areas.

Overall, WEX CardControl is an excellent solution for EFS or Fleet One cardholders who need to manage their cards on-the-go. It provides quick and easy access to important card functions, making it an essential tool for drivers who rely on their cards for fuel and other expenses.