All packages have a 30-day guarantee or money back your first month onboard.
Most packages yes, you can cancel without any penalties. However, when canceling if you paid for a full year of that product (on selective few) there is a cancelation fee. When purchasing for the month, the cancelation will be finalized at the end of that term, and no credits or prorations will occur. This is to keep confusion to a minimal to what is due or owed back to the customer.