Delete OSCall sources
1. Enter Cydia -> Manage -> Sources -> Edit ,then click on thebutton in front of OSCall to delete OSCall sources .

Uninstall client package
1.Enter Cydia -> Manage -> Packages,find out OSCall software in the lists,click and enter,the following picture will appear,
2.Click Modify -> MRemove,after removing successfully,the screen will display a Reboot SpringBoar,click to continue back to homepage .