You can certainly cancel your Prime membership after your free trial.
In fact, you can cancel at any time and you will not be charged for future Prime membership.
However, if you have used any of the benefits that come with Prime, such as free two-day shipping or streaming movies and TV shows, you may be charged for those services.
So it really depends on what benefits you used during your trial period.
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How do I cancel my free Amazon Prime trial?
There are a few different ways to cancel your free Amazon Prime trial.
The first way is to go to the Amazon Prime website and click on the “Cancel my membership” link.
This will take you to a page where you can confirm your cancellation.
Another way to cancel is to contact customer service. You can do this by going to the Amazon website and clicking on the “Contact Us” link.
From there, you will need to select “Prime Membership” as your issue and then choose “Cancel my membership” from the list of options.
You can also call customer service at 1-888-Link (1-888-iot-6784).
Source: How to Cancel an Amazon Prime Free Trial: 15 Steps (with Pictures) (wikihow.com)
What happens if I cancel my Prime membership early?
If you cancel your Prime membership before it expires, you will not be refunded for the remainder of the membership.
Cancelling Prime also means you will no longer have access to free two-day shipping, Prime Video, Prime Music, or any of the other benefits that come with a Prime membership.
Source: What happens if I want to cancel my Amazon Prime membership? – Quora
Why can’t I cancel my Amazon Prime free trial?
You may not be able to cancel your Amazon Prime free trial because you have signed up for a monthly subscription.
If you do not want to continue your monthly subscription, you will need to cancel your membership before the end of the trial period.
Is Amazon Prime’s free trial actually free?
Yes, Amazon Prime’s free trial is actually free. You can enjoy all the benefits of a Prime membership for 30 days without having to pay a dime.
Plus, if you decide to become a Prime member after your free trial, you’ll receive a $10 credit towards your first purchase.