Is it reliable and safe to charge the flow card from 80 rpm to 240 rpm?

Reliable. If it's official mobile phone news, it's safe. Sometimes, when doing activities, there will be a flow card from 80 yuan to 240 yuan. There are two types of mobile cards. One, like a mobile phone card, has a monthly rent and a phone bill, so you can call and send text messages. The second type is the pure flow card mentioned on the Internet, which is the so-called thing card. IOT card has no monthly rent, so you can't make phone calls or send text messages.