Hello,
I have the same issue but when using wireless sharing, I have unlimited data and want to share it with the router which would handle all the networking staff (all my other devices would connect to it instead of my iPhone), unfortunately it’s not working reliably at all, the router keeps disconnecting from the iPhone, it just unusable.
I’ve an android phone that I tried and it works just fine, it driving me nuts, any help would be appreciated.
Thanks