Two stun guns each capable of discharging 200,000 volts were ordered by a Birmingham man over the internet, city magistrates heard.
But the weapons were intercepted by Customs & Excise officers at Dover after being sent by a French firm.
Aqial Araf (36), of Clipston Road, Alum Rock, pleaded guilty to one charge of possessing a prohibited weapon and two charges of attempting to possess a prohibited weapon.
Sentence was adjourned until April 8 for a medical report to be prepared on Araf, who was allowed bail.
When interviewed, Araf said he had paid £50 for the cell phone gun which he obtained from a website.