Hello,
Our account is limited to 500 MB per month of data. However, we use our WiFi (broadband) connection for Internet and data downloads while at home. But it still registers the data download against the data service plan. I have checked the WiFi connection on the phone, Galaxy S4, and the connection to our WiFi router is good, so it makes no sense that the data downloads would be charged against our 500 MB data usage plan. Please let me know if there's another app, setting or process that bypasses our WiFi connection and uses cellular network instead.