The basic joke is clear: he wants to pretend to be a better person than he is. And if those are clouds they seem to be in line at the Pearly Gates — but, if so, how can he use his phone? And what’s the significance of the way the others are portrayed: golfing, eating a piece of cake, etc.
Comics I Don't Understand 
I would guess that all four are pictured as they were when they died. Having the phone is no different from the others having their props. As for using it, well, he must have one helluva premium phone plan.
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