Free trials usually demand a card and quietly flip to a paid plan the moment the trial runs out. A virtual card lets you take the trial while keeping full command over whether it ever charges you a cent.
Cap the card to the plan
Set the card ceiling at or just under what the paid plan would run. If you forget to cancel, a charge above your cap is simply bounced instead of silently billed.
Freeze it, do not trust your memory
As the trial winds down, freeze the card. A frozen card cannot be charged, so the trial cannot convert even if the cancellation date sails right past you.
One card per trial
Issue a separate card for every trial. That stops a single service from hoarding a reusable method, and it makes each trial easy to shut off on its own.
Keeping your main card safe
Because the trial never touches your bank card, a forgotten trial can never reach your main funds. You delete the card and the whole thing is closed.