Don't deal with bad public wifi, just use your Galaxy S5's connection instead
Turning your smartphone into a mobile hotspot can save you from painfully slow public WiFi or the crappy free internet your hotel provides. With a battery that can last hours, the Galaxy S5 is the perfect companion for times when you need your own dedicated wireless connection. You may need to make sure you've got a proper plan with your carrier, though.
Here's how to use the mobile hotspot feature:
How to turn the Samsung Galaxy S5 into a wireless hotspot
Swipe down from the Home screen of your Galaxy S5 to pull now the Notifications shade.
Tap on the Settings icon in the top right.
Now find Tethering and Wi-Fi hotspot and tap on it to select it.
In the next menu, tap on Mobile Hotspot.
Turn it On at the top by tapping on the On/Off toggle.
Hit OK on the Attention screen advising you that WiFi will be turned off.
Follow the directions at the bottom of the screen to connect another device to your Galaxy S5.