[smileyface]

So if I put a burner phone in a trashcan that I try to turn into a Faraday cage, will it still receive a phone signal?

Or has my insulation failed?

[LonePalm]

That depends.

Is the trashcan metal?
Is it completely enclosed?
Are the trashcan and lid effectively grounded?

If you answer yes to all then it is a proper Faraday cage. Try calling the number. If the phone rings, something is wrong.

WWG1WGA

Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)