This worked for us but note that each binocular has a slightly different geometry. The phone's camera lens must be at the correct distance from the binoculars eyepiece, otherwise the binoculars will not have enough range to focus the image. You may not have to do what we did, but then again, you may have to.
π Nikon ACULON A211 8x42 Binoculars: High Quality Optics for Exceptional Viewing
15 Review
Enhance Your Stargazing Experience With Orion'S Premium Telescope Accessory Kit (1.25-Inch, Silver)
21 Review
Discover The Wonders Of The Universe With Orion StarBlast 4.5 Telescope In Teal Color
14 Review
Nikon ACULON 10 22X50 Binoculars Harness
12 Review