Why can’t I use wifi outside of my house

Are you saying you don't have internet access when you're away from home, like in a car? Or something else?

Can you make phone calls?

~Lyssa

Do you mean wifi doesn't work when you're at someone else's house? Or something else?

~Lyssa

Wi-Fi is very short range; typically about 50 meters (165 feet). Once you are farther away from your router than that you can’t use Wi-Fi. Your phone should also have cellular data (called mobile data in some countries). Go to Settings/Cellular (or Settings/Mobile Data) and see if you can turn it on. If you cannot you must contact your cellular network provider.

Your router is probably somewhere in your house that doesn’t reach that far. Does your phone switch to cell data when you are outside?

If you have a cell data plan and it is not switching over check with your cell service provider.