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No. Hyphen is fully usable on your own — calendar, expenses, notes and more. Inviting your co-parent is optional and can be done at any time from More → Co-parent.
Open More → Co-parent, generate a 6-digit code, and share it. The other parent enters it during onboarding (or in the same screen) to join your household.
Location is opt-in and set up by a parent. You pair a child's secondary phone using a 6-digit code from your account; that device then shares its position with the parents and always shows that sharing is active. You can stop it at any time.
Hyphen Pro is billed through your Apple ID. Manage or cancel it anytime in Settings → [your name] → Subscriptions on your iPhone.
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