If you smartphone has a data plan and is a recent Android model, yum can MAKE a "Hot Spot" to get another DEVICE into the Internet.
The post is base on an article that was in life hacker awhile back.
http://lifehacker.com/5930111/use-your-android-phone-as-a-wi-fi-hotspot-for-free

My own personal experience has been little. In fact, this is the first day I got it to work for me. The app offers a trail until you research a data limit. Either you buy it or reset the connection.
But a free app did not work and asked me to install more stuff. That was not for me.
For a huge list of possible solutions, I did this search:
android hot spot apps
Wow!. Got too much information. So instead, I went to the GOOGLE Play store.
So I need your help. Which of these apps is best for a stingy computer user the wants the best for free. On a current Android phone you shouldn't need to use a third party app - There should be an OPTION for something along the lines of "Tethering and Portable Hotspot" in the device settings.I have a grandfathered unlimited data plan from Verizon so the Hotspot feature on my phone is disabled. I use a 3rd party app called FoxFi to turn on my phone's hotspot.