If you have a smartphone with a data plan – Apple (iPhone) or Android (Samsung Galaxy, LG, etc.) – and don’t have an Internet connection, then use your phone as your “Internet” by creating a hotspot! Click on the links below for instructions on how to turn your phone into a hotspot.
Short tutorial video for both Apple and Android
Step-by-step instructions for Android phones (source: Android Phones for Dummies, by Dan Gookin)
Step-by-step instructions for Apple iPhones (source: Apple support)