FYI for those who are buying a 3+ collar without "upgrading" from Fi

You can successfully activate the collar, however, with membership deals, such as the Costco deal (3+ collar with 14 months subscription), you'll forfeit whatever months you have left on your current membership to activate the collar and the 14 months.

They will not combine the 14 months to your current subscription

This is pretty ridiculous, because it's got to be an easy thing to do. However, with Costco's deal in particular ($150 for the new 3+ collar & 14 months subscription) you'll end up getting a much better deal than going through Fi directly for the $99 "upgrade" to the 3+ module with no additional subscription months.