Apple Music - Apple
"Get 3 months of Apple One free with any new iPhone, iPad, or Mac.**"
The footnote says, in part,
"New and qualified returning subscribers only. $21.95 or $27.95 or $39.95 per month after trial based on plan selected. The Apple One free trial includes only subscriptions that you are not currently using through a free trial or a subscription. Only one offer per Apple Account and only one offer per family if you’re part of a Family Sharing group, regardless of the number of devices you or your family purchase. This offer is not available if you or your family have previously accepted an Apple One three-months-free offer."
If you were allowed to have two free trials before, count yourself lucky, because these offers almost always have a "new subscribers only" type condition.