What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
What do you mean by ""upgrade features may be accessed by my customers"? When you upgrade, the plan benefits take effect right away. Which is basically the increase on the account limits:
Monthly Submissions Limit.
Available Space(for you to store uploaded files)
Sub-user Accounts(this feature is for you to share your forms with another account, it does not mean "inheriting" account benefits).
Monthly Form Views(https://www.jotform.com/help/355-Form-View-Limits-What-is-it-all-about).
Total Submission Storage.(unlimited for any paid plan)
Let us know if you have more questions.