Currently you are not allowed to delete the verification phone number which is bound with your Alibaba.com account by yourself.
To delete the verification phone number:
1. Please download the application form (This application form can be an electronic document, but the signature needs to be handwritten);
2. Fill all required information, then contact the Customer Service Team with the following documents:
Personal user: 1. Above application form to delete verification phone. 2. The photo of your passport/Identity card/driving license etc. (For account ownership confirmation only)
Company user: 1. Above application form to delete verification phone. 2. The photo of your business license (For account ownership confirmation only)