Can I unsubscribe from a Roaming Pass? What do I do if I no longer wish to have internet/data roaming access?

No, the Roaming Pass will expire automatically when the validity period ends. To avoid being charged with additional roaming rates or fees, you are advised to disable or turn off the 'Data Roaming' or 'Cellular Data/Mobile Data' function on your phone before the validity period expires. You will otherwise then subject to standard international roaming charges.