EvilZone

I'm new to this forum, but not new to programming/hacking. I've never used a 3G/4G USB modem before and I have a question about it. Is it possible to anonymously purchase and access the network? I don't want free access, I just need it to be 100% anonymous. This is not for what you might be thinking. I want to be able to use a rasberry pi and 3G modem in a remote location to anonymously upload data (probably via FTP) to the pi.