The story
Zong appeared in 2008, as a new mobile payment solution in the USA, an offshoot of Echovox that allowed users to pay for items online directly through their mobile phone bills. This was made to boost the business development of this disruptive application.
In 2011 the former CEO of mobile payments technology developer Zong, David Marcus sold Zong to PayPal as he become the new president there.
In May 2015, Zong disappeared from the web without any public declaration.
From Wikipedia’s article on Zong (payments provider), shared under CC BY-SA 4.0.4