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What’s the best iphone to buy?
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The one that best meets your needs after you compare your needs with the available phones on the market. You can compare iPhone models with this link→iPhone - Compare Models - Apple, but you will have to use other online review sites to compare with phones from other manufacturers. Here is a good place to start→https://www.nytimes.com/wirecutter/electronics/smartphones/ as it is (relatively) unbiased.