Are they paired? If you didn't pair them, they won't connect.
If they're paired, they should connect. They may connect only for media, not for phone calls (if there's no mic in the headphone, it would be difficult for it to handle phone calls) but they should connect.
Or is this a new problem - they used to connect, now they stopped connecting? If so, try deleting them from the phone, then pairing them again.
If you need any more help,
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