It doesn't cost money to sign the downloaded software on the 3G portal. Before signing, you need to apply for a certificate and download a manual signing software. Registration and downloading of hand-signed software are all done here in the visa system of 3G portal. The specific application method is: directly log on to the home page of 3g portal-> Software->; Visa system: enter the mobile phone serial number on this page of the visa system, and then submit an application for a permit, which can be submitted within 60 minutes; At the same time, in the visa system, please click to enter the manual signature tutorial. Click this link to enter, and you can see the steps of signing the whole software. Manual signature software is also downloaded here. You can go to the 3G portal to learn more about this.