How to know that you have spyware on your S4
quick way to remove them without downloading third party apps is through a factory reset, which can be done using the following steps:
a. Press the Menu key.
b. Open the Settings.
c. Choose Accounts.
d. Select the Back up and Reset options.
e. Tap the Factory Data Reset command.
f. Confirm your action when a prompt shows up.
Just be sure to backup all the important data in your Android phone though before doing this. It should be noted that the above steps for factory reset are for the Galaxy S4. The method may vary depending on the version of your Android OS or unit. For instance, instead of selecting Accounts, other phones require selecting Privacy.