Military wife from another little planet

Not long after returning home, Lin Shu received a call from a strange number.

"Mother?"

Lin Shu just surprised 0.1 seconds, then calmly and Mrs. anser talk.

Compared with the situation that visiting the backstage network of the United Nations is like visiting one's own back garden, it's really not even a piece of cake to get through her phone without knowing her phone number?

What's so surprising.