I noticed this about 4 days ago. At that time, there was just one line ( the one which is now longer ), and it was only 1/2 length. In the 4 days, the length doubled, and the second line appeared.
The lines seem to have a certain thickness that does not change when I do the macro shot under different angles, as I would expect to be the case if it was the top glass cracked - I would expect a glass crack to be thin. And I do not feel anything when touching the glass.
Any idea of what this is, and what to expect from Samsung service ? The phone is under warranty, but service here in Czech Republic is generally horrible, and even foreign companies seem to have matched the local service awfulness....
Thanks for any info, Paul.