Is there a proration of charging for Roam Like Home Monthly if I subscribe any time within the bill cycle?

There is no proration of charging if you subscribe at any time during your full cycle. However, you will still be getting the full 5GB of Internet Roaming, 60 minutes of Roaming Voice calls and 60 minutes of IDD Voice calls (if applicable) upon subscription which is valid for the remaining period of your bill cycle.