I looked on my phone and that app dont even exsist!! someone help.
It is an SMS service. I also had these fraudulent charges on my bill. Call Sprint customer service and they will reverse this month's charge and also will block the service from your phone.
Also, submit a complaint to the FTC regarding Jumpah's fraudulent business practices. (https://www.ftccomplaintassistant.gov/FTC_Wizard.aspx?Lang=en)
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