How to unlock Apple Music subscription paid through MTN carrier billing in Nigeria?

Re: "How to unlock Apple Music subscription paid through MTN carrier billing in Nigeria?"

Try restarting your iPhone : (ie: restarting deletes temporary files, re-establishes connections, may update the subscription changes you made, and often restores order if something is not working as expected.)

If needed: How to: Restart your iPhone - Apple Support

Check you are signed in to your iPhone with the correct Apple Account you used to purhase the subscription:

Sign in to your Apple Account on the web or in your device settings - Apple Support

Check your purchase history to make sure the purchase went through ok,

If needed: See: View your purchase history for the App Store and other Apple media services - Apple Support

Subscribe to Apple Music - Apple Support

Eg: says (After your subscribe)

1. "Open the Apple Music app and tap Home.
2. Tap the My Account button, your photo or initials.
3. Sign in to your Apple Account."

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Else: Wondering whether you used the mobile billing to add the funds to your Apple Account before subscribing:

On checking which payment methods Apple can accept in your country or regiion

Payment methods that you can use with your Apple Account - Apple Support

Eg: says:

Nigeria

• Apple Account balance (from adding funds)
• Most credit and debit cards

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To contact Apple Assistance in Nigeria:

Apple website: Official Apple Support

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For more info. / support / contact options, etc.

(eg: try online chat / email from the "Get Support - start now link at the bottom) on one of the websites below)

Billing and Subscriptions support website: Subscriptions and Billing - Official Apple Support

or

Music Support Website: Music - Official Apple Support