This is a quick design I made of a cradle for my LG G4 - I had one of those cases with a little leg to stand on which broke, and I wanted something to keep my phone upright while charging on my desk. "Proper" charging cradles have their own little USB port, but my experience with them is that either their port breaks or they damage the phone's USB port - this just uses whatever cable you may have lying around.
The only trick is that the cable should bend forwards and not backwards, as shown in the picture. Bending it backwards to hide the cable would require more height for the space that holds the phone, and the model is already tall enough.
The design was made in Fusion 360, and it's essentially two triangles with a rectangle connecting them. It was a matter of drawing a sketch, extruding to cover for the width of the phone then using more extrusions to remove unnecessary material in the middle. I think you could get away with even less material, but I like my models to be on the chunky side :-).
You can print it in one go without supports - I believe the largest overhang angle is about 40 degrees or so. It prints just fine at 0.3mm layer height and 20% infill, with 2 shells and a 2-pass skirt to prime the extruder (no need for rafts or brims - this has plenty of support on its own).