The online mobile card market is chaotic, and some unscrupulous merchants cheat consumers by means of false propaganda, card theft and fake long-term packages. False propaganda means that merchants attract users to buy by exaggerating the capacity of traffic packages or monthly rental prices, but the actual deduction is inconsistent with the commitments of merchants, and there is fraud. Stealing cards means that merchants deliberately send IOT cards to consumers, not ordinary traffic cards. IOT card has some problems such as virtual standard traffic, so it can't be used normally. Fake long-term package means that merchants promote mobile phone cards with only a two-year preferential period as long-term packages, resulting in poor traffic or high monthly rent for consumers after two years, and they cannot protect their rights. In order to avoid being routine, users should choose a regular and reliable platform to buy a flow card, verify relevant information, and avoid choosing a low-priced flow card for cheap. At the same time, know the details and validity period of the package, so as not to be misled by false propaganda.