The board does contain gold
Extracting precious metals from the inside of the circuit board is indeed very harmful to the environment and the health of the operator
However, as long as the extracted gold is pure enough and does not contain toxic heavy metals, it will generally not cause harm to people
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Of course, your situation has nothing to do with the above.
Such a big bracelet, four or five mobile phones, let alone the gold in the circuit board, it is estimated that the copper in the circuit board is not enough.
So this bracelet is probably something like copper zinc alloy, and then electroplated into gold (not necessarily gold-plated).
In general, this is purely to cheat your old old woman's old mobile phone, a bracelet cost is higher than the kind of pot ah basin ah to replace the old mobile phone. What about this cheap accessory? You might have a metallic reaction, but it's not for everyone.
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All in all, there's no harm other than getting scammed out of four or five phones. But don't wear the bracelet.
There is indeed gold in repairing mobile phone circuit boards, but this method of refining gold has great pollution to the environment, so the general environmental protection Bureau is not allowed to privately extract gold.