How to fix stripped screw holes on iphone?

In the process of having my wife's iphone screen fixed, the repair guy must have stripped two of the screw holes that hold down the Wi-Fi antenna. When I try to put the screws back in they just keep turning and don't grab onto any of the screw hole thread. Does anybody have an idea how to fix the screw hole. I was thinking of getting a wider diameter screw, but I have no idea where to purchase such tiny screws. Any advice is appreciated.

I bit of tape in the threads will change the diameter of the hole or an epoxy/ silicone.

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