Skip to main content
Effective Date: July 13, 2026 Last Updated: July 13, 2026

​
1. Agreement to Terms

These Terms of Service (“Terms”) govern your receipt of one-time authentication code (OTP) SMS messages from Offline Protocol, Inc. (“Company”, “we”, “us”, “our”) when you choose to sign in or create an account using a phone number. By providing your phone number and requesting an authentication code, you agree to these Terms. If you do not agree, do not use phone-based authentication and use an alternative sign-in method where available. These Terms supplement — and do not replace — the terms governing the application you are using (for example, the Fernweh Terms of Service). In the event of a conflict between these Terms and an application-specific terms of service regarding SMS authentication, these Terms control only with respect to the SMS authentication campaign.

​
2. Campaign Scope

This campaign is limited to transactional authentication messages sent during login and sign-up. Specifically:
  • We send SMS messages containing one-time codes to verify ownership of your phone number
  • Messages are triggered only when you request an authentication code
  • We do not send promotional, marketing, or advertising messages through this campaign
For information about how we handle your phone number and related data, see our SMS Authentication Campaign Privacy Policy.

​
3. Eligibility

To use phone-based authentication via SMS, you must:
  • Be at least 13 years of age (or the minimum age required in your jurisdiction, if higher)
  • Have the legal right to use the phone number you provide
  • Be able to receive SMS messages on the device associated with that number
If you are between 13 and 18 years of age (or the age of legal majority in your jurisdiction), you may use this service only with the consent of a parent or legal guardian who agrees to these Terms on your behalf. You represent that the phone number you provide is accurate and that you are authorized to receive messages at that number.

​
4. How the Service Works

  1. You initiate login or sign-up in an Offline Protocol application.
  2. You voluntarily enter your phone number and request an authentication code.
  3. We send a single SMS containing a one-time code (for example: Your Offline Protocol login code is: 123456. It expires in 10 minutes.).
  4. You enter the code in the application to complete verification.
  5. Codes expire after approximately 10 minutes and may be used only once.
We may apply rate limits or other security measures to prevent abuse. We are not obligated to deliver messages if we detect fraudulent, abusive, or suspicious activity.

​
5. Your Responsibilities

You agree to:
  • Provide a valid phone number that you control
  • Keep your phone and account secure
  • Notify us promptly if you suspect unauthorized access to your account
  • Not attempt to intercept, share, or misuse authentication codes
  • Not use phone-based authentication for any unlawful purpose
You are responsible for all activity that occurs when your phone number is used to authenticate your account, unless caused by our failure to maintain reasonable security safeguards.

​
6. Message Terms

​
6.1 Transactional Messages Only

All SMS messages sent under this campaign are transactional. They are sent solely to deliver authentication codes you have requested. We will not use this campaign to send marketing or promotional content.

​
6.2 Message Frequency

Messages are sent on demand. You typically receive one SMS per authentication request. Additional messages may be sent only if you request a new code (for example, if a code expires or delivery fails).

​
6.3 Carrier Charges

Message and data rates may apply. You are responsible for any charges imposed by your mobile carrier. Contact your carrier for details about your messaging plan.

​
6.4 Delivery

We use third-party providers (including Twilio Inc.) and mobile carriers to deliver messages. We do not guarantee that messages will be delivered without delay, or at all. Delivery may be affected by carrier outages, network conditions, device settings, or factors outside our control.
By entering your phone number and requesting an authentication code, you consent to receive a transactional SMS at the number you provide for the purpose of identity verification. Your consent is:
  • Voluntary — you may use alternative authentication methods where available
  • Purpose-limited — authentication codes only
  • Revocable — as described in Section 8

​
8. Opt-Out and Help

​
8.1 Opting Out

You may stop receiving SMS authentication messages by:
  • Replying STOP to any message from us (this may unsubscribe your number from further SMS from our sending number)
  • Choosing not to request additional codes
  • Using an alternative sign-in method (such as email-based authentication) where available
  • Contacting us at support@offlineprotocol.com
Note: Opting out of SMS may prevent you from using phone-based authentication until you contact us or use an alternative sign-in method.

​
8.2 Help

For assistance, reply HELP to any message from us, or contact support@offlineprotocol.com.

​
9. Prohibited Conduct

You may not:
  • Provide a phone number you do not own or control without authorization
  • Request authentication codes for numbers you do not have permission to use
  • Attempt to circumvent rate limits, abuse detection, or security controls
  • Use automated tools to request codes in bulk
  • Interfere with message delivery systems or our service providers
  • Use SMS authentication for any fraudulent, harassing, or illegal activity
We may suspend or refuse phone-based authentication for any user or number that violates these Terms or applicable law.

​
10. Third-Party Services

SMS delivery is facilitated by third-party providers, including Twilio Inc. and your mobile carrier. We are not responsible for the acts or omissions of these third parties, except to the extent required by applicable law. Your use of phone-based authentication may also be subject to your carrier’s terms and policies.

​
11. Disclaimers

THE SMS AUTHENTICATION SERVICE IS PROVIDED “AS IS” AND “AS AVAILABLE” WITHOUT WARRANTIES OF ANY KIND, WHETHER EXPRESS OR IMPLIED, INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT. We do not warrant uninterrupted, timely, secure, or error-free message delivery.

​
12. Limitation of Liability

TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, OFFLINE PROTOCOL, INC. AND ITS OFFICERS, DIRECTORS, EMPLOYEES, AND AGENTS SHALL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES, OR ANY LOSS OF PROFITS, DATA, OR GOODWILL, ARISING FROM OR RELATED TO YOUR USE OF SMS AUTHENTICATION — INCLUDING FAILURE TO RECEIVE A CODE, DELAYED DELIVERY, OR UNAUTHORIZED ACCESS TO YOUR ACCOUNT — EVEN IF WE HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. OUR TOTAL LIABILITY FOR CLAIMS ARISING FROM OR RELATED TO THIS SMS AUTHENTICATION CAMPAIGN SHALL NOT EXCEED ONE HUNDRED U.S. DOLLARS (USD $100) OR THE MINIMUM AMOUNT REQUIRED BY APPLICABLE LAW, WHICHEVER IS GREATER. Some jurisdictions do not allow certain limitations of liability. In those jurisdictions, our liability is limited to the fullest extent permitted by law.

​
13. Indemnification

You agree to indemnify, defend, and hold harmless Offline Protocol, Inc. and its officers, directors, employees, and agents from any claims, damages, losses, or expenses (including reasonable attorneys’ fees) arising from your misuse of phone-based authentication, your violation of these Terms, or your violation of any third-party rights.

​
14. Changes to These Terms

We may update these Terms from time to time. When we make material changes, we will update the “Last Updated” date at the top of this page. Your continued use of phone-based authentication after changes become effective constitutes acceptance of the revised Terms.

​
15. Governing Law

These Terms are governed by the laws of the State of Delaware, United States, without regard to conflict-of-law principles, except where preempted by mandatory consumer protection laws in your jurisdiction.

​
16. Contact Us

For questions about these Terms or the SMS authentication campaign: Offline Protocol, Inc. Email: legal@offlineprotocol.com Support: support@offlineprotocol.com