I don't think I ever posted what I finally did with that acrylic phone.
I wanted to paint the inside of my home's old phone niche, and that painting was a test. It was hard since I'm not really a painter, and I didn't want to do it again.
Ultimately, I just cut the phone out of the Canson XL sketchpad paper. It has several acrylic layers on it so the piece was at least sturdy, except for the dangling pieces of phone cord. I then used Golden heavy gel medium to glue it to a 12x16" piece of Arches oil paper.
Then it was easy to make a sketch around it and paint a funky background using oil pastels.
Then I took the finished painting on the Arches paper, applied framer's tape on the back around the edges, and inserted/pushed it into the niche.
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View from the hallway:
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I've been looking at that bare niche since we moved in, and I'm glad to finally have it done.