This is what I have been wanting since I first started using Square in 2010. Thia past week I have been researching mobile hot spots to carry with me to shows. I have one show (Westmoreland Arts and Festival, PA) where I have the hardest time getting a cell signal so I figured a mobile hot spot would solve the problem. Now I do not have to worry about it...
https://squareup.com/help/en-us/article/5095-process-payments-with-offline-mode
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The part about the transaction limit bothered me since most of my transactions are over $100. Apparently you can change it but it seems you have to be in offline mode to do so. I couldn't find any way to change it (or even see it) when I enabled offline mode earlier today. this is a welcome addition to Square.