Add SMS/MMS messaging privacy section with carrier-required language
about mobile data not being shared for marketing. Add SMS messaging
terms with opt-in/opt-out/HELP details, message frequency, and
carrier disclaimers. Update terms to describe double opt-in process
for marketing messages. Fixes two 10DLC campaign rejection reasons:
verbal opt-in compliance and privacy policy requirements.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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