Is the secondary card number of children's watches the same as the primary card?

Same. The children's watch secondary card is a secondary card bound to the SIM main card, which is mainly used for family members. It has the same functions as the main card, including voice function, short message function, traffic packet, call reminder, MMS and other functions, and the main card package for monthly rent consumption. So it's the same. Children's watches are a long-standing category in the market. In the early 2G network environment, the functions provided by children's watches are very limited, mainly based on simple low-frequency positioning functions.