The campus card has expired, and I don't want to change my number.

What you want to ask is what if the campus card expires and you don't want to change it? Renew the original package and change the package.

1. The original packaging of the campus card is still within the validity period. You can negotiate with the operator to renew the original package and keep the number unchanged.

2. The original package has expired or is no longer applicable. You can negotiate with the operator to change other suitable packages to keep the number unchanged.