A:Answer Hi fellow costumer,
If you cancel your Apple Music subscription after 3 months, you should still be good for the remainder of your 4-month free period. Just remember, if you cancel before the trial ends, you won’t be billed when the trial is up, but you also lose access to your tunes right away. So, mark your calendar if you want to squeeze every last note out of the deal!
I hope this helps and you don't get overcharged!