Number of columns for mobile devices in grid systems [on hold]

Currently designing in Adobe XD me and my team were discussing about the perfect approach to grid systems. What's the current standard and how should we handle the number of columns for mobile devices?

1. Go the standard way and get rid of some columns:

desktop - 12 columns
tablets - 8 columns
phones - 4 columns

2. Resize the columns width and gutter and stay 12 columns all devices?