Why can I not connect to my neighbors Wi-Fi?

Me and my neighbors are very close, we go to each other s houses and have the password to each other s Wi-Fi. However, when I got my iPhone 5s I was unable to connect to their Wi-Fi. I can connect to anyone else s including my own Wi-Fi. My brother and sister can connect to it easily, so it seems to be just my phone. I know they did not block it from me because they ve tried to connect me themselves. Any idea what's wrong or what I could do?

No one magically knows without more info

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