I'm a lone parent and my boys have regular time with their dad every week. A couple of weeks ago my son (aged 11) wouldn't stop playing on the computer when I told him to. I gave him a few mins to think about it and reminded him that the consequences of not following house rules are no access to devices and no screen time for 24 hours. He still wouldn't stop so I switched off the Wi-Fi and told him no devices or screen time for 24 hours. He kicked off big time and became very disrespectful. My other younger son (aged 9) was behaving well so I decided my time was best spent with him. During my time upstairs with younger son my older son decided to hide my mobile phone and then announced very proudly that I'd never find it. I was so angry at him and didn't really know what to do next. He was very smug and told me with a smirk that I didn't deserve it back and now I'd know how he feels when I take away his devices.
I'm keen to know what other parents would've done in this scenario.
My phone was on silent so I couldn't call it to make it ring. I needed my phone for work purposes and I had no idea where he hid it. I literally turned the house upside down ... much to his amusement!
I felt I had lost control as a parent and he had the upper hand! 
I dished out every threat I could think of that I knew I could carry through. He just laughed and said he didn't care cos it was worth the fun!
Little monkey!!! 