Screen Magnifier and Smart Phone!

Hey guys, I want to replace my laptop for a smartphone. There's the issue with a desk working environment and one solution is to buy an external display The other one is to use a screen magnifier as shown on the picture.

Ultimately it should be possible to use any 3x Fresnel lens magnifier and make your 5" phone display into a 15" laptop size one, which is perfect for me! The magnifiers used for reading, like this one are cheap and portable but don't look very well around the edges.

None of the phone screen magnifiers on Amazon ships to my country so I don't have any experience with them, although they appear to be exactly what I need. If anyone has such a device at hand I'd love to hear how well this works for you. Please comment below.