Sub-processors
We use a small number of carefully vetted third-party services to deliver the Call Milly platform. Each has a Data Processing Agreement in place.
Last updated: 1 January 2026
Amazon Web Services (AWS)
Cloud infrastructure, data storage, and compute
Data location: United Kingdom (eu-west-2)
Twilio
Voice calling and SMS/WhatsApp delivery
Data location: United Kingdom / EEA
OpenAI
AI language model for conversation handling
Data location: EEA (data processing agreement in place, no data retention)
Stripe
Payment processing and billing
Data location: United Kingdom
Postmark
Transactional email delivery
Data location: United States (EU SCCs in place)
Sentry
Error monitoring and application performance
Data location: EEA
Notification of Changes
We will notify you at least 30 days before adding or replacing a sub-processor. If you have concerns about a new sub-processor, you may object in writing within that period. We will work with you to address your concerns or, if they cannot be resolved, you may terminate the affected services.
To receive sub-processor change notifications, email hello@callmilly.com with the subject “Sub-processor notifications”.