Hi Joycequilla,
Thanks for posting in Apple Support Communities. The following steps should help with activating your Apple Music subscription from your wireless carrier:
- Your carrier will send you a text message with a link to activate your subscription.
- Open the text message and tap the link.
- Follow the onscreen steps to sign in with your Apple ID and link your phone number. If you see a message that says "This subscription is already being used with a different Apple ID," contact Apple Support to unlink your Apple ID.
- If you have a Dual SIM phone, you can activate your Apple subscription on your default line.
This information and more can be found here: Activate Apple subscriptions from your wireless carrier - Apple Support
In addition to those steps, please ensure that your Apple ID country/region is set to the same country/region as your wireless carrier. You can reference the information within the following resource on how-to check: Change your Apple ID country or region - Apple Support
We hope this helps.
Cheers!