My airpods won't connect to my iPhone but will connect to everything else

I bought them from Apple and also my iPhone is from Apple (it's the 6 so it is about 4 years old). The thing is that my airpods connect to everything else. From one of the first iPad mini's to my macbook to an old iPhone 5S I have around my apartment to all of my parents and sisters Apple products, these airpods work fine. Then, the minute I attempt to connect it to my iPhone, they just don't work or if they do, they work for a couple of seconds and then stops.

Have you tried other Bluetooth devices on your iPhone? If they don't work as well then you have a fault with your phone making Bluetooth not work properly.

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