Phone StackPhone Stack

Terms of Service

Last updated: May 16, 2026

1. Acceptance of Terms

By accessing or using Phone Stack's AI cold calling platform, website, and related services (the "Service"), you agree to be bound by these Terms of Service ("Terms"). If you are using the Service on behalf of an organization, you represent that you have authority to bind that organization to these Terms.

2. Description of Service

Phone Stack provides an AI-powered cold calling platform that enables businesses to create AI callers, manage contact lists, launch calling campaigns, and analyze call results. The Service includes call recording, transcription, AI summarization, and campaign analytics. The Service is powered by third-party AI services as described in Section 3 below.

3. AI Services and Transparency

Phone Stack integrates the following third-party artificial intelligence services to deliver its core functionality:

  • Google Gemini (Google LLC) — real-time conversational AI voice agent that conducts phone calls
  • Anthropic Claude (Anthropic PBC) — post-call analysis, summarization, sentiment analysis, and AI-assisted training
  • Deepgram (Deepgram Inc.) — speech-to-text transcription of call recordings

Your use of the Service involves the transmission of call audio and related data to these providers for processing. Each provider operates under its own terms of service and privacy policy. For details on how data is shared with and handled by these providers, see Section 7 of our Privacy Policy.

We may update the AI services we use as technology evolves. Material changes will be communicated in accordance with Section 16 of these Terms.

3.1 AI-Generated Content Disclaimer

Calls conducted through Phone Stack are performed by artificial intelligence, not human agents. All AI-generated content — including spoken responses during calls, post-call summaries, sentiment scores, action items, and training recommendations — is produced by automated systems and may contain errors, inaccuracies, or omissions.

You acknowledge that:

  • AI-generated speech may not perfectly represent your business, brand, or intentions
  • Call summaries, scores, and analytics are approximations and should be reviewed before being relied upon for business decisions
  • AI responses are non-deterministic and may vary between calls even with the same configuration
  • Phone Stack does not guarantee the accuracy, completeness, suitability, or reliability of any AI-generated content

You are solely responsible for reviewing AI outputs and for any actions you take based on AI-generated content. Phone Stack shall not be liable for any losses or damages arising from reliance on AI-generated content.

4. Account Registration

You must create an account to use the Service. You agree to provide accurate, current, and complete information during registration and to keep your account information updated. You are responsible for maintaining the confidentiality of your account credentials and for all activities that occur under your account.

5. Acceptable Use

You agree to use the Service only for lawful purposes. You must not:

  • Use the Service to make calls that violate the TCPA, FCC regulations, or any applicable telemarketing laws
  • Call numbers on the National Do Not Call Registry or state DNC lists (Phone Stack does not perform DNC scrubbing — you are solely responsible for scrubbing your lists before uploading)
  • Use the Service for harassment, threats, fraud, or deception
  • Misrepresent your identity or the purpose of your calls
  • Use the Service to call emergency services (911) or government lines
  • Attempt to reverse-engineer, decompile, or extract the source code of our AI models
  • Share your account credentials or allow unauthorized access
  • Use the Service in any way that could damage, disable, or impair our infrastructure

6. Compliance & Consent

You are solely responsible for ensuring that your use of Phone Stack complies with all applicable laws, including the Telephone Consumer Protection Act (TCPA), FCC regulations, the FTC Telemarketing Sales Rule, and applicable state and local laws. Phone Stack does not verify consent, scrub Do Not Call lists, or guarantee legal compliance. You are responsible for obtaining all required consent from persons you contact using the Service.

6.1 Your Consent to Be Contacted by Phone Stack

By creating an account, submitting a business verification, or otherwise providing your contact information (including your phone number and email) to Phone Stack, you expressly consent to receive communications from Phone Stack and its service providers at the phone number(s) and email address(es) you provide. These communications may include:

  • Automated, autodialed, pre-recorded, and AI-generated voice calls (including calls using artificial or synthetic voice technology);
  • SMS and text messages (including automated messages); and
  • Email messages.

These communications may be used for account verification, onboarding, billing and payment, customer support, product updates, security notifications, demos, sales follow-up, and other service-related and marketing purposes. You understand that message and data rates may apply and that message frequency varies.

Consent is not a condition of purchase. Your consent to receive automated or AI-generated calls, texts, and emails is not required in order to purchase any goods or services from Phone Stack.

You represent that you own or are the primary user of the phone number(s) and email address(es) you provide, and that you have the authority to grant this consent on behalf of any business or organization you are registering.

Revocation / Opt-Out. You may revoke this consent at any time by (a) replying STOP to any text message, (b) clicking the unsubscribe link in any marketing email, (c) telling our representative on a call to stop calling, or (d) emailing support@phonestack.com. Revoking consent for marketing communications will not stop transactional communications required to operate your account (such as billing notices and security alerts).

7. Indemnification

You agree to indemnify and hold harmless Phone Stack Corp. from any claims, damages, fines, penalties, or expenses (including attorneys' fees) arising from your use of the platform, including violations of the TCPA or any applicable telemarketing law. This obligation survives termination of your account.

8. Billing and Payments

Pricing

Phone Stack uses per-minute pricing based on actual talk time. Current pricing is displayed on our pricing page. We reserve the right to change pricing with 30 days' notice.

Talk Time Calculation

Talk time is measured from when a prospect answers the call to when the call ends. Ringing time, voicemail detection, and busy signals do not count toward talk time. Minutes are rounded up to the nearest second.

Free Trial

New accounts receive 30 free minutes of talk time. Free minutes expire 30 days after account creation. No credit card is required for the free trial.

Subscription Billing

Paid plans are billed monthly in advance. Usage overages are billed at the end of each billing cycle. All fees are non-refundable except as described in our refund policy.

Refund Policy

We offer a 14-day money-back guarantee on your first payment. After 14 days, payments are non-refundable. Unused minutes do not roll over to the next billing period.

9. Intellectual Property

The Service, including its AI models, software, and documentation, is owned by Phone Stack and protected by intellectual property laws. Your content (contact lists, training data, call recordings) remains your property. You grant us a limited license to use your content solely to provide the Service.

10. Data and Privacy

Our use of your data is governed by our Privacy Policy. By using the Service, you consent to the collection and use of your data as described in the Privacy Policy.

11. Third-Party Integrations (Google & Microsoft API Services)

Phone Stack offers optional integrations with third-party services, including Google (Gmail and Google Calendar) and Microsoft (Outlook Mail and Microsoft 365 Calendar via Microsoft Graph). When you connect a third-party account, you authorize Phone Stack to access and use that service on your behalf in accordance with the scopes you grant.

11.1 Google API Services

Phone Stack's use of information received from Google APIs adheres to the Google API Services User Data Policy, including the Limited Use requirements. Details about the specific Google scopes we request, how we use Google user data, how we protect it, and how to revoke access are described in Section 10 of our Privacy Policy. You are responsible for complying with Google's Terms of Service and any sender policies (such as anti-spam and bulk-sending limits imposed by Gmail).

11.2 Microsoft API Services

Phone Stack's use of information received from Microsoft Graph and other Microsoft APIs adheres to the Microsoft APIs Terms of Use, the Microsoft Services Agreement, and, where applicable, requirements of the Microsoft Cloud Partner Program and the Microsoft 365 App Compliance Program. Details about the specific Microsoft Graph scopes we request (Mail.Send, Calendars.ReadWrite, User.Read, offline_access), how we use Microsoft user data, how we protect it, and how to revoke access are described in Section 11 of our Privacy Policy.

You are responsible for complying with Microsoft's terms, including the Microsoft Services Agreement (for personal Microsoft accounts) or your Microsoft 365 / Entra ID tenant agreement (for work or school accounts), and any sender and anti-abuse policies imposed by Outlook and Exchange Online. If you are an administrator granting consent on behalf of a Microsoft 365 tenant, you represent that you have the authority to do so and that your organization's users have been notified as required by your internal policies.

11.3 General Third-Party Account Obligations

You represent that you have the authority to connect any third-party account you authorize and that your use of that account through Phone Stack does not violate any agreement with the third-party provider. Third-party services may change, suspend, or revoke access at any time; Phone Stack is not liable for disruptions caused by third-party providers acting independently of Phone Stack.

12. API Access and Third-Party AI Integrations

12.1 API Keys

Phone Stack provides a REST API that allows you and authorized third-party applications to programmatically access certain features of the Service, including triggering calls, managing agent profiles, and retrieving call results. API keys are scoped credentials that grant access to your account data. You are responsible for keeping your API keys confidential and for all actions taken using them.

12.2 Third-Party MCP Integrations

Phone Stack publishes a Model Context Protocol (MCP) server that allows AI assistants (such as Claude by Anthropic and ChatGPT by OpenAI) to interact with your Phone Stack account on your behalf. When you authorize an MCP integration:

  • You grant the connected AI assistant access to your Phone Stack account via your API key
  • The AI assistant may trigger calls, create profiles, and retrieve call results within the permissions of your API key
  • Call data (including phone numbers, names, transcripts, and extracted information) may be displayed within the AI assistant's interface
  • Your API key is stored encrypted by the MCP server and is never exposed to the AI assistant directly

You may revoke third-party access at any time by deleting or rotating your API key in Settings → API. Revoking an API key immediately invalidates all MCP sessions using that key.

12.3 API Usage Limits

API calls are subject to rate limiting. Calls triggered via the API consume minutes from your account balance at the same rate as calls triggered via the dashboard. Batch operations are limited to 500 contacts per request.

12.4 API Data in Tool Responses

When third-party AI assistants access your Phone Stack data via MCP, the following information may be included in responses: contact phone numbers, names, email addresses, company names, custom fields, call transcripts, AI-extracted data, call dispositions, and call durations. Long transcripts may be truncated. You are responsible for ensuring that your use of third-party AI assistants complies with applicable privacy laws regarding the data returned.

13. Service Availability

We strive to maintain 99.9% uptime but do not guarantee uninterrupted service. We may temporarily suspend the Service for maintenance, updates, or security reasons. We will provide reasonable notice of planned downtime when possible.

14. Limitation of Liability

To the maximum extent permitted by law, Phone Stack shall not be liable for any indirect, incidental, special, consequential, or punitive damages, including lost profits, lost revenue, lost data, or business interruption, regardless of the cause of action. Our total liability shall not exceed the amount you paid to us in the 12 months preceding the claim. Phone Stack shall not be liable for any fines, penalties, or regulatory actions imposed upon you by any governmental authority arising from your use of the Service.

15. Termination

Either party may terminate the agreement at any time. You may cancel your account through the dashboard settings. We may suspend or terminate your account if you violate these Terms. Upon termination, your right to use the Service ceases immediately. We will retain your data for 30 days after termination, after which it will be permanently deleted.

16. Governing Law

These Terms are governed by the laws of the State of California, without regard to its conflict of laws provisions. Any disputes shall be resolved in the state or federal courts located in San Francisco County, California.

17. Changes to These Terms

We may update these Terms from time to time. Material changes will be communicated via email or through the Service at least 30 days before they take effect. Continued use of the Service after changes take effect constitutes acceptance of the updated Terms.

18. Contact Us

If you have questions about these Terms, contact us at:

Phone Stack Corp.
Email: legal@phonestack.com
San Francisco, CA, United States