Unhappy [Q] Galaxy S4 SHV-E300s Homescreen Menace

A friend of mine gave me this South Korea Telecom SHV-E300s galaxy S4. I cant get the network LTE, WCDMA,3G,2G to come and the IMEI is 000000000000000/01. Any suggestions on how to get back my IMEI? the device is not rooted also because knox is keeps showing a ' KNOX Images Only' message. Someone help me get rid of this annoying window on the interface that is showing device details on my home screen and app drawer screens. When i open an app the window is does not appear. On the Service Mode>Debug Screen>Phone Control> i cant see Perso menus. Thanks to whoever reads this post,and much gratitude to whoever helps me solve this conundrum.
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