To register with Amazon using a mobile phone, you can follow the steps below:

1. First, download and install the Amazon Shopping App on your mobile phone. The app is available for iOS and Android systems, and you can search and download it in the App Store or Google Play Store.

2. Open the Amazon Shopping App and select the "Create a New Account" or "Register" option.

3. On the registration page, you need to provide your name, email address, and password. Please make sure that the email address you provide is valid and can receive confirmation emails.

4. After filling in all required fields, click the "Continue" button.

5. Next, you need to provide your delivery address information. This address will be used for order delivery when you shop.

6. Confirm your contact information, you can choose mobile phone number as the contact information, and enter your mobile phone number. Amazon will send a confirmation code to the phone.

7. Enter the confirmation code you received and click the "Verify" button.

8. You can choose to follow some Amazon recommendations and select different preferences, then click the "Save" button.

9. Congratulations on completing the Amazon mobile registration process! You can now browse and purchase the products you are interested in. Please note that Amazon's registration process may vary slightly depending on your country or region. The above steps are for reference only, and you can adjust them accordingly based on the specific interface of the Amazon shopping application you are using.