Laptop speakers make a pinging noise when my phone is next to them

That's the phone's radio, not a fault. When it talks to the cell tower it sends short bursts, and the unshielded audio circuit in the laptop picks them up and plays them as that dit-dit-dit sound. Old desk speakers used to do it right before a call came in. Harmless to both devices. Move the phone a foot or so away, or put it on wifi calling / airplane mode while you work, and it stops.