City mobile phone carriers unveil all-you-can-listen packages

Shanghaiist recently heard that Shanghai Telecom was introducing a new "all you can listen" package, where by paying 6 yuan a month you no longer pay for any incoming calls coming from Shanghai, no matter what kind of phone it is -- which means mobile phones, land lines, and the "Personal Handy Phone System (小灵通)" phones. Well, it turns out that in response to this, Shanghai Mobile has come out with a basically identical package. The Chinese article we read is here. It seems you can sign up just about anywhere. Has anyone out there tried it?