Please continue up the line to find the context.

The grandparent does not have his sim card.

> The grandparent does not have his sim card.

which is not necessary for transferring your number to a new SIM. when you lose your phone here, you don't lose your number.

Depends. Google was not able to recover my Google Project Fi number because I was abroad. And when I was back in the US it was "too late"