If you're looking to upgrade your phone, but don't want to spend a fortune, Amazon's Prime Big Deal Days could be your opportunity to score one for less. Instead of coordinating a trade-in and data plan at a specific carrier, you can often find better deals on unlocked devices at Amazon — particularly during sales events . Unlocked phones aren't tied to a specific carrier, so you'll have the flexibility to switch plans and shop new phones as often as you want. Not to mention, you'll be able to use local SIM cards when traveling internationally without having to jump through hoops.

Amazon's October Prime Day event doesn't kick off until Oct. 7, but we're already seeing some unlocked phone deals worth grabbing. A few Motorola and Samsung Galaxy phones have already dropped to reco

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