Is it possible to remove cell borders from Numbers? I imported an Excel spreadsheet that contained a few cells with black lines as their border.  Is it possible to remove these outlines through Numbers (iOS)?

I have tried copying and pasting, the Format > Cells > Border Style, and deleting the contents, but the black border always remains (and actually spreads if I copy and paste the contents elsewhere).
It's not iOS but this is how they've done it on OSX:
Under the "Table" tab, uncheck "Grid Lines"



You might also set "Table Outline" to "None" and play with the 3 buttons to the right to add/remove grid lines from the headers.