Hi Kidaba,
Thanks for reaching out to Microsoft Q&A.
Yes you can utilize the free trial for VM(Azure VM) and Storage(ADLS, Azure Blob...) plus all the other services that are offered by azure through azure cloud portal. After your free-trial period is over or the credit limit is exhausted whichever occurs first, you have to upgrade your account to pay-as-you-go model if you want to continue using the services that you have created.
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