Maybe I'm missing it, but can't find a hot spot widget either on my phone, nor on Google play. There are plenty of Hotspot widgets on play but none that I've tried work with the s5.
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I was having the same issue, I wanted a quick easy way to access my mobile hotspot. Although I did not find a widget application , I was able to create a shortcut using "anycut" , which is available through Google Play and does not require root.