Is it necessary to cancel the mobile phone card issued by the school when I was in college?

Better cancel. Cancellation is free and the balance will be refunded. Do not cancel the mobile phone, keep the number for 3 months, and deduct 5 yuan every month. That is to say, it can still be cancelled within three months. If you don't cancel after 3 months, you will be blacklisted. After the last two blacklists, your ID card cannot handle mobile-related business.

brief introduction

SIM card is the key for GSM mobile phone to connect to GSM network. Once the SIM card is removed from the mobile phone, the mobile phone will not be able to enjoy all kinds of services provided by network operators except emergency calls.

SIM card can not only be used as a key, but also provide a lot of convenience for users. Users only need to insert or embed the SIM card into any GSM terminal to realize communication. SIM card also manages a lot of information provided to users, which can be used to store short messages, especially those received when users are away or absent.

20021May 12, the Ministry of Industry and Information Technology held a video conference in Beijing to prevent and control telecommunication network fraud, strengthen the risk remediation of key businesses such as telephone cards and Internet of Things cards, and accurately rectify the illegal transactions of "telephone cards and Internet of Things cards".