SMS Opt-In & Messaging Flow

Last updated: August 2026

🔍 Reviewer Quick Access

Opt-in URL: https://[app-domain]/login

Opt-in flow screenshot (this page): https://[app-domain]/sms-opt-in

Privacy Policy & SMS Terms: https://[app-domain]/privacy-policy

How to verify: Visit /login — the phone login tab is the default view. You will immediately see the phone number input, the consent checkbox (unchecked by default), and the "获取验证码" button (disabled until checkbox is checked). A live interactive replica is shown in the "Opt-In Flow Screenshot" section below on this page.

Use Case

This application uses A2P 10DLC SMS messaging exclusively for account registration, login, phone number verification, and identity verification. Users voluntarily provide their mobile phone number on the sign-up / login page and actively request a one-time verification code (OTP) via SMS.

SMS messages are transactional verification messages only. They are not used for marketing, promotions, or any non-verification content.

Opt-In Flow Screenshot (Live Demo)

Below is a visual replica of the exact opt-in form users see on the /login page. The checkbox is unchecked by default and the submit button remains disabled until the user actively checks it.

📱 手机号快捷登录

Phone Sign-Up / Login (opt-in form)

输入手机号获取短信验证码 / Enter phone to receive SMS OTP

🔒 Button disabled — checkbox unchecked by default
1

User enters phone number

User navigates to /login (default tab = phone login) and types their mobile number.

2

Consent checkbox — unchecked by default

The checkbox is NOT pre-checked. The user must actively tap it to consent before the submit button activates.

3

Submit button disabled until consent

The '获取验证码' (Get Code) button stays disabled (greyed out) until the checkbox is checked. This enforces active opt-in.

4

SMS OTP sent

Only after consent + submit does the system send exactly one (1) SMS containing a 6-digit verification code. No other messages are sent.

5

User enters code to verify

User enters the 6-digit code on the verification screen to complete registration / login.

👆 Interactive demo: Try toggling the checkbox above to see how the submit button stays disabled until the user actively consents. This is the exact behavior on the live /login page.

Opt-In Method

Opt-in type: Web form (on our website during account registration, login, and identity verification flows).

Opt-in location URL: The phone sign-up / login page is publicly reachable at /login on this site. The phone login tab is the default view when visiting /login — users see the phone input, consent checkbox, and "获取验证码" button immediately without any navigation. Users enter their phone number and must check the consent checkbox before the "获取验证码" (Get Code) button is enabled.

Opt-in flow screenshot (hosted): /sms-opt-in — this page includes a live interactive replica of the opt-in form showing the unchecked-by-default checkbox and disabled submit button.

Message Flow (Step by Step)

  1. User navigates to /login and chooses the phone login option.
  2. User enters their mobile phone number in the input field.
  3. User must actively check a consent checkbox (unchecked by default) acknowledging the Privacy Policy and SMS Terms before the "获取验证码" (Get Code) button is enabled.
  4. The "获取验证码" button remains disabled until the checkbox is checked — active consent is required.
  5. Upon submission, a one-time verification code (OTP) is sent to the user's phone number.
  6. User enters the 6-digit code to verify and complete registration / login.
  7. No further SMS messages are sent unless the user initiates another verification request.

Consent Language & Checkbox

The opt-in checkbox is unchecked by default. The exact consent text shown next to the checkbox is:

"我已阅读并同意《隐私政策》与《短信服务条款》"
(Translation: "I have read and agree to the Privacy Policy and SMS Terms of Service.")

The checkbox links directly to our Privacy Policy & Terms, which includes full SMS disclosure (opt-in consent, STOP/HELP, message frequency, no marketing, not a condition of purchase, carrier liability disclaimer).

Message Frequency & Opt-Out

Message frequency: One (1) SMS per verification request. Frequency varies based on user-initiated activity only.

Opt-out: Users may reply STOP to opt out of SMS messages at any time, or HELP for assistance.

Cost: Message and data rates may apply.

Purchase condition: Consent to receive SMS is not a condition of purchasing any goods or services.

Required Disclosures & Links

Privacy Policy & Terms of Service (publicly accessible)

Phone sign-up / login page (opt-in form)