More information about the charges, which are very high:
DPRK to offer mobile internet access for foreigners - China.org.cn
"
We will provide both a USB modem and your current own SIM card to get access to Internet, respectively costs 75 euro and 150 euro upon registration, with different levels of charge standard, from 400euro/10G, 250euro/5G, to 150euro/2G for USB and 10 euro for SIM card per month"
Is €150 a record price for buying a prepaid SIM card?