What about i dont have a wifi connection can use cellular data?

Yes, in general, no if you mean to update iOS or download large apps.

Then you will have to go somewhere with Wi-Fi, such as a Apple store, other electronics store, Starbuck’s, MacDonald’s, almost any coffee shop, diner or cafe, a friend, a neighbor.

One option would be to connect your iPhone directly to a computer that does have an Internet connection.