When Should I Get an Auto Insurance?

Hi!
Just wanted to know when i should get an auto insurance. I m planning to buy a used car this week. Should I get insurance before buying the car, or after?
I already checked some quotes. Progressive seems to be the cheapest.
Thanks

Suggestion:

You can buy the insurance now and call the Insurance company when you take possession of the car to activate the policy. They will need the description and VIN# anyway.

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