Article 21 Individual industrial and commercial households operating used goods shall go directly to the public security organs of the people's governments at the county level where they are located for registration of special industries, and then, with the approval documents of the public security organs, go to the administration for industry and commerce departments at the same level for registration and obtain business licenses.
Article 31 of the old goods operators shall acquire and entrusted by others to sell, consignment of old goods for inspection. The value of more than 100 yuan of old goods should be recorded in detail its basic characteristics, sources and destinations.
Article 32 of the old goods operators shall register the sale, consignment and entrusted by others to sell, consign the old goods of the name of the unit and individual identity card; entrusted to deal with the old goods of the unit and individual, but also should be strictly check the entrusted unit's power of attorney and the commissioner's identity card.
Article 33 of the old goods operators to accept the entrusted agent sales or custody of old goods, shall establish a strict system of handover, custody and payment of goods, clear responsibilities to avoid disputes. According to Article 59 of one of the following acts, shall be sentenced to a fine of five hundred yuan or more than one thousand yuan; the circumstances are serious, shall be sentenced to five days or more than ten days of detention, and impose a fine of five hundred yuan or more than one thousand yuan:
(a) pawnbroking industry staff to undertake pawning of goods, do not check the relevant certificates, do not fulfill the registration procedures, or knowingly suspected of criminal violations, stolen goods, and do not report it to the public security organs;
(2) in violation of state regulations, the acquisition of railroads, oil fields, power supply, telecommunications, mining, water conservancy, surveying and urban utilities and other waste special equipment;
(3) the acquisition of public security organs informed of the search for stolen goods or suspected of stolen goods;
(4) the acquisition of the state prohibits the acquisition of other items.
To summarize the situation you described, the police station is based on the provisions of Article 59, paragraph 3 of the punishment, but the police station asked you to pay a fine of 3,000 yuan has no legal basis.
As to whether you violated the above provisions, it depends on whether you in the acquisition of the cell phone involved in the following circumstances:
One, your acquisition of the cell phone without the original purchase invoice and other related documents;
Two, your acquisition price is significantly lower than the price of the same type of industry recycling price;
Three, not in accordance with the provisions of the registration of the seller's identity documents or false registration.