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What should I do if I buy the wrong phone case size?

Find a merchant to return the goods.

If you bought it online and happen to have transportation insurance, it's very simple. You just need to apply for a refund, and then buy a novice case that matches your mobile phone. If there is no freight insurance, I suggest you buy a new one and don't return it, because mobile phone cases are generally very cheap. It may be said that your return freight is more expensive than your mobile phone, so if there is no freight insurance, the freight may be more expensive than your mobile phone case.