Mobile phones are ridiculously expensive these days, and consumers are often backed into a corner by carriers and retailers. There is a way of bringing the cost down, however, so long as you don't mind a few lock screen adverts and offers. That's the essence of Amazon Prime Exclusive Phones, which can be bought for considerably less than retail price, with the caveat being that Amazon kind of owns your lock screen, and can use it to try to sell you things.

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