Complete Guide to Claude Account Registration, Login, and Device Switching

Claude is an AI assistant developed by Anthropic, designed to support writing, coding, analysis, and more. For new users, following the correct registration and login process is essential for a smooth experience. This guide walks you through creating a Claude account, linking your phone number, and switching between devices or accounts — helping you get started quickly.

1. How to Register a Claude Account

First, go to the official Claude website (claude.ai) and click the "Sign Up" button in the top-right corner. You can register using an email address or sign in directly with your Google or Microsoft account. If you choose email registration, enter a valid email address and set a password that is at least 8 characters long and includes both uppercase and lowercase letters as well as numbers.

After submitting your details, check your email inbox for a verification message. Click the link inside to confirm your email. Note that verification emails may sometimes land in the spam folder — if you don't see it within 10 minutes, you can request a new one. Once verified, you'll be taken to the Claude main interface, where a basic free account is ready to use.

2. Account Binding and Security Settings

To improve account security, it is recommended to bind a phone number in the settings. Go to your profile icon, select "Settings" → "Security", and click "Add Phone Number". Enter your phone number, then input the SMS verification code you receive. After this step, you can enable two-factor authentication (2FA), which requires a dynamic code in addition to your password each time you log in — significantly reducing the risk of unauthorized access.

If you use third-party login (such as Google), you can manage the connection under "Connected Accounts". This allows you to recover your account via the third-party provider even if you forget your password, which is very convenient.

3. Multi-Device Login and Account Switching

Claude allows simultaneous access from a desktop browser and the mobile app. After logging in on your computer, download the official Claude app (available for both iOS and Android) on your phone, then sign in using the same account via QR code or by entering your email and password. Note that the free plan only supports one active session at a time — switching devices will not forcibly log you out, but the new session will replace the temporary state of the old one.

If you need to switch between accounts (for example, a personal account and a family account), tap "Log Out" in the sidebar of the mobile app, then enter the other account's credentials. On desktop, click your profile icon in the top-right corner and select "Sign Out". It is recommended to use different accounts on your work computer and personal phone to keep conversations organized.

4. Common Login Issues and Solutions

Many users report not receiving verification emails or SMS messages. Try using a different browser or clearing your cache. If you forget your password, click "Forgot Password" to reset it via email. Additionally, Claude may restrict certain VPN nodes — if you see "Access Denied" during login, try switching your VPN to a server in the United States or Europe.

If your account gets locked (usually due to multiple incorrect password attempts or triggering security checks), you can contact Anthropic support at support@anthropic.com. After providing your registered email and account details, you can typically expect a reply within one business day.

That completes the full guide to Claude account registration, binding, and switching. By following these steps, you should be able to use all of Claude's features smoothly. If you still have questions, feel free to leave a comment below.