What does the character 5 1 mean? I got a text message.

Looks like a penalty notice. In fact, you have never used their software. In fact, you were asked to dial that 95 number to get you hooked.

This is a scam. There are also many kinds of fraud methods, such as:

1. Fictitious car tax refund fraud trap: The criminals tried to get the detailed information of the car buyer in advance, contacted the victim by phone or SMS in the name of the staff of the tax bureau, finance bureau or vehicle management office, and lied that they could enjoy the preferential car tax refund policy according to the relevant policies recently promulgated by the state, and reported the name and address of the victim. ...

2. Fictitious or pretending to be a friend of the victim's relatives needs funds to let the victim remit money to the account provided by him. Once the victim is credulous, he will often be deceived because of his kindness. Coping strategy: When receiving a strange phone call, pay attention to verify the true identity of the other party, and ask the other party's location and the name of the handling unit.