You can purchase new features or upgrade to a new plan at any time.
Shared, Reseller, and Semi Dedicated Hosting:
You can upgrade your plan from the Client Area. The upgrade is automatic and seamless. There will be no interruption in service during the upgrade.
VPS and Quasi Dedicated Server:
You can upgrade your plan from the Client Area. The upgrade is automatic. The server will be rebooted to complete the upgrade.