Apex domains cannot have CNAME records.
Question and response
Question
dig phoneinfosource.com. NS
Answer
phoneinfosource.com. 2 NS ns2.phoneinfosource.com.
phoneinfosource.com. 2 NS ns1.phoneinfosource.com.
Authority
The response has no authority records.
Additional
ns1.phoneinfosource.com. 2 A 184.105.221.68
ns2.phoneinfosource.com. 2 A 212.38.183.176
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0