How to fix apps in iphone 4 after the icloud bypassing?

I bought an iphone 4 for my little sister off of ebay. Problem is they sold it to me with the icloud lock with a message from find my iphone saying to please call cause the phone was lost… So i did. I called & i texted the number that it showed me. However, no one answers. I also was able to bypass the icloud passlock but the apps won't work. I went to contacts where there was another phone number… The owners phone number & i called, texted that number too. No answer. So i was wondering how i could go into the settings to change the icloud information. So my little sister can finally have her phone. I tried the owners, but nothing came out of it. I tried doing the right thing. Can someone please help me enable the apps again?

In iphone 4 you can bypass activation lock and used it like an Ipad but you can't make calls. Search tutorials on the net. This tutorial doesn't work on 4S, 5, 5c, 5s just A4 type. Here is a tutorial. https://www.appaddict.org/forum/index.php?/topic/1807-how-to-bypass-the-ios-activation-lock-on-the-iphone-4/