If there is any time such a thing is feasible, it would be today. There are services such as Clear (clear.com) which provide 4G connectivity in many urban/suburban areas. When I called Clear to inquire, they said yes my modem and account will be portable to any Clear area without having to request authorization, though if I move I should call and have my billing address updated if I want to keep getting my bills in the mail. The popo could try to jam Clear, I suppose, but this practice would draw the frowns of the FCC.
You made a false argument. If you don’t have it, then don’t present it. It still does not finish the line of questioning from the police.