How to install mobile cards in ZTE F 100?

ZTE F 1OO can use mobile 2G cards and Unicom 2G and 3G cards, but the F 1OO distributed to Tsinghua people is set by Unicom, so only Unicom 2G and 3G cards can be used. However, due to the large cargo volume, some machines are not set up or omitted, so I understand that Tsinghua F 1O0 can still use mobile 2G cards.