The Go Unlimited Plan doesn't exist anymore for new customers. Existing customers already on the Go Unlimited, Beyond Unlimited, or Above Unlimited Plan can likely see the Go Unlimited Plan as an option if they aren't already on the Go Unlimited Plan.
Are you referring to the Start Unlimited Plan? It is $35 per month for 4 lines and after the autopay and paperless billing discount. It is $70 per month for one line after the autopay and paperless billing discount.