Really? I thought they usually used to have no filters, especially on the front camera. Well of course the lenses always filtered some IR light, but I wouldn't

Really? I thought they usually used to have no filters, especially on the front camera. Well of course the lenses always filtered some IR light, but I wouldn't call that a filter, they also "filter" non IR light. A filter to me is a dedicated element or coating that prevents the majority of IR to be transmitted.