How many columns can bootstrap have?

Bootstrap's grid system allows up to 12 columns across the page. If you do not want to use all 12 column individually, you can group the columns together to create wider columns:

How do I get a column below 480px in Bootstrap?

(I don't have enough rep to see other folks' deleted posts.) "If you downloaded the Bootstrap CSS file (not using a CDN) you can just change the min-width on the .col-sm media query from 768px to 480px. Then using class col-sm-6 will be for 480px and up and .col-xs-12 will give you the single column you want below 480px."

Does bootstrap treat tablet size the same as phone size?

I have been developing a bootstrap website and I have found 1 very major flaw, it treats tablet size the same as phone size, the col-xs-x (for 768px and under) applies to iphone and ipad alike. With my design I use 2 columns for desktop and tablet size, once in the phone size I want it to be 1 column but bootstrap has no way to do that

Does bootstrap have a grid system?

Bootstrap's grid system is responsive, and the columns will re-arrange depending on the screen size: On a big screen it might look better with the content organized in three columns, but on a small screen it would be better if the content items were stacked on top of each other. Tip: Remember that grid columns should add up to twelve for a row.