Does it cost money to bind the mobile phone to Easy Net?

Netease 20 10 just launched 163 mobile phone number mailbox, which is bound with 163 mailbox and implements "one box with two numbers". The specific benefits should be: first, you can send and receive oversized attachments; Second, you can use your mobile phone to send and receive emails; Third, it's easy to remember.

Netease itself said that it does not charge any fees for registering the bound 163 mobile phone number email address, but telecom operators have to charge activation SMS fees.

Netease can't explain clearly how to charge in use, how to charge telecom operators and other matters.

My understanding is:

Bind the 163 mailbox to the 163 mobile phone mailbox (a double-numbered box), and the activation and use of the mobile phone mailbox are free. Your mobile operator will charge you a short message fee when it is opened, and Netease will never charge you any fees.

Question:

During the use of the mobile phone number mailbox (not referring to the registration binding), Netease does not charge, does the mobile operator charge?

If you don't use your mobile phone to send and receive emails, but bind your mobile phone number and email address, and only use it through your computer, will mobile operators charge?

Netease didn't elaborate, so I don't know if there is a charge trap.