Standard text and multimedia message rates apply to RCS messages, based on your current AT&T rate plan. If your plan includes unlimited texts, you won’t be billed for Advanced Messaging.
1Each RCS chat, message, or attachment is charged separately. If you have limited messages or a pay-per-use plan, you’ll be billed at your current messaging rates. If you send a message with multiple attachments, each attachment as well as your text is counted and billed separately.
Example: If you send a text message and attach a photo and a video, it’s billed as three messages. Files can be photos, videos, contacts, calendar items, or any other attachment.
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