Apex domains cannot have CNAME records.
Question and response
Question
dig xfoneusa.net. NS
Answer
xfoneusa.net. 5 NS dns1.nts-online.net.
xfoneusa.net. 5 NS dnscache02.xfoneusa.net.
xfoneusa.net. 5 NS dnscache01.xfoneusa.net.
xfoneusa.net. 5 NS ns2.xfoneusa.net.
xfoneusa.net. 5 NS ns1.xfoneusa.net.
xfoneusa.net. 5 NS dns2.nts-online.net.
Authority
The response has no authority records.
Additional
ns1.xfoneusa.net. 5 A 209.16.64.1
ns2.xfoneusa.net. 5 A 199.254.157.40
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0