Can't verify the payment method on my iPhone's Apple Account

You may not have an SMS plan (Domestic & International) enabled by your carrier for the SIM/eSIM that you use on your device. Apple Inc. does not provide SMS services.

For OTPs (One-Time Passwords):

• How they’re usually sent: OTPs are often sent via SMS.
• Requirement: Because they rely on SMS, you do need an active SMS plan on your SIM card to receive them. If your SIM isn’t active or your plan doesn’t support SMS, you won’t get the OTP.
• Other delivery methods: Sometimes, OTPs can also be sent through email, push notifications, or authentication apps, but SMS is the most common.

For Verification Codes:

• How they’re sent: Verification codes can be sent through multiple channels:
  • SMS (requiring an SMS plan)
  • Email (no SMS plan needed)
  • App-based authenticators like Google Authenticator or Microsoft Authenticator (no SMS plan needed)
  • Push notifications to a trusted device (no SMS plan needed)
• Requirement: Verification codes don’t always require an SMS plan, since they can be delivered through other internet-based methods.

In short:

• If the verification code is sent by SMS: You need an SMS plan.
• If it’s sent by email, app, or push notification: No SMS plan is required.

Contact your bank for help.