There is no charge if you don't use roaming data. However, the phone continues to consume small amounts of data due to automatic app updates even if you do not use the app. Under this circumstance, if you have subscribed to the Roaming Data Day Plan, the daily fee will be charged. If you want to completely avoid roaming data charges, you have to switch off data roaming in your phone's settings.

Roaming Data Day Plan can be used on any smartphone or feature phone with an active Day Plan.