What do you mean the mobile phone card is free? It only takes a month.

Free mobile phone card delivery usually refers to the "Free Spring Card Delivery" campaign launched by China Mobile for new users, mainly for users aged 16~25 who have already applied for China Mobile's mobile phone number and meet certain conditions. These conditions may include no previous China mobile number, short access time, and the length of using China mobile service.

During the activity, users can get a mobile phone card for free, which contains a certain amount of traffic, free call duration and free SMS number. Usually this calling card will be kept in the user's personal data for one month. If the user runs out of traffic, talk time and text messages in the calling card within one month, he can get a new calling card.

It should be noted that sending a phone card for free does not mean that the user does not have to bear any expenses. If the user generates additional expenses in the process of using the calling card, such as exceeding the traffic usage, calling overtime, etc. , he/she needs to pay the corresponding fees according to the standards of China Mobile.

In addition, if the user needs to pay a certain fee, usually 100 yuan, this fee will be gradually returned to the user's account in the subsequent use process. In the process of using calling cards, users also need to abide by the regulations and terms of China Mobile and safeguard their rights and interests.

Please note that the above contents are for reference only. If you need more detailed information or have questions about specific details, it is recommended to directly consult China Mobile's customer service or related business personnel.