Mobile Client Analysis: Being a Guest

Today, I saw a mobile client product online called ZuoKe, which belongs to the free SMS category. It claims to be the most genuine free SMS software currently available. Unlike Pinco and Xrose, Zozoc does not require any points, and it is compatible with both Mobile and Unicom networks. It only calculates SMS traffic and charges GPRS fees (if you have a monthly package, it's equivalent to not spending any money). In this software, there is also a group messaging function, similar to creating a QQ group where you can send messages freely, whatever you want. On its registration page, it states that they aim to create an international version of Skype. They already have 480,000 registered users, which is quite impressive without much publicity. I also read one of the founder's blogs, where they mentioned they aim to reach 1 million users by October this year. However, it seems quite challenging at the moment. I simply tried out this so-called completely free product: ZuoKe.