After installation on Samsung Galaxy S4 and S5 everything about 2 weeks was ok. I felt protected by Kaspersky. But then began actually impossible: Kaspersky locked my cell phones for no apparent reason, so - as if the phones were stolen. I could not even make calls. So: Enter recovery code - but for some reason not as planned, but as PIN on the phone PIN entry - of which we read in Kaspersky in the descriptions nothing. There an input of the recovery code is always described in the Kaspersky surface that was but after tapping "unlock" away. Who wants to take the PIN to enter the recovery code? Kaspersky Online Support replied to my inquiries never !! The phone support was helpless - I should like to address SAMSUNG. After many inputs of PIN, PUK and recovery code I got the hang of (first PIN, then recovery code, then the PIN) While out how to unlock the phone again - but it's just annoying. So Kaspersky Internet Security Android've uninstalled - and have gone back again satisfied with my phones.