Hello, before the 3G package was changed, did you sign a contract to pre-store the phone bill and send it to your mobile phone? Because you can't reduce the package during the contract period. Then, it is generally not allowed to transfer the package within 3 days after the new card is activated. Finally, it is not allowed to transfer the package in the online business hall on the last day of the month (but it can also be transferred at the end of the month if you go to the physical business hall). Thank you.