I paid 20 yuan for the mobile traffic package, but the result was not enough. I want to pay 50 yuan for this parcel. Excuse me, how to change texting?

In the serial number that appears, select 662 as the flow refueling package.

After sending 662, select the prefix of 50 yuan 1G traffic from the obtained short message and send it to 10086 for ordering.

I suggest you cancel the traffic in 20 yuan at the same time, otherwise the communication company will think that you want the superposition of these two packages.