https://freeui.design/the-screens-free-psd-mockup-template/
https://free.lstore.graphics/simple-phone-mockups/
https://www.figma.com/
https://free.lstore.graphics/iphone-x-mockups-4k-resolution/
http://facebook.design/handskit
https://free.lstore.graphics/box-mockups/
https://dribbble.com/shots/3482192-Pastel-Smartphone-mockups
https://uispace.net/
https://lstore.graphics/freebies/white/