Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2023	May 04, 2023
Details
Registrant CIK	0001092570
Fiscal Year End	--12-31
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2023
Document Transition Report	false
Entity File Number	000-27031
Entity Registrant Name	FULLNET COMMUNICATIONS INC.
Entity Incorporation, State or Country Code	OK
Entity Tax Identification Number	73-1473361
Entity Address, Address Line One	201 Robert S. Kerr Avenue, Suite 210
Entity Address, City or Town	Oklahoma City
Entity Address, State or Province	OK
Entity Address, Postal Zip Code	73102
City Area Code	405
Local Phone Number	236-8200
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		19,565,087
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1