https://azure.microsoft.com/en-us/support/options/#plans
https://cloudacademy.com/course/understanding-azure-pricing-and-support/support-options
Trial, testing, and development
If you’re using Azure in a non-production environment or just trying it out, the Developer plan provides unlimited technical support during business hours.
Production workloads
When you’re running a production workload on Azure and need a fast response, get unlimited technical support, on demand, with the Standard plan.
Business-critical functions
If you need faster response times, advisory services, and high-severity incident escalation management from a collaborative account management team, choose Professional Direct support.
Comprehensive Microsoft technology support
If you need company-wide support across Azure and other Microsoft technologies, consider Enterprise support. 这个就是premier support
a premier support plan can only be purchased by companies that have an enterprise agreement 这个是True
