Dish does not have a 30 day policy for the contract. As soon as the contract is signed, it is enforced. Directv has a 24 hour policy. The grace periods are myths, and can cause a lot of turmoil. The only 30 day policy is on purchases such as a sound bar for buyers remorse.
I thought that some states had laws that require 30 days though. You're right that Dish does not though.