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I bought an used iphone where everything seems to work apart from the wifi, which can only find a network if it’s just next to router. I went through the guides but can’t understand how could I fix this and exactly where is the antenna responsible for the wifi signal power. Thanks in advance for any help you can provide

iPhones, unlike Samsung phones, are very hard to get into and repair. If you really wanted to give it a go yourself, you can buy a new antaenne on IFixit for 14.00 and try to replace it. The antaenne is located in the top of the phone. (The anatanne for wifi and cellular service are different parts) If you don’t want to go through that and risk messing up your IPhone, you should probably take it to a professional repair place.