How do you spoof phone numbers?

Because of the Covid-19, my sis has to work from home. She still needs to make work-related phone calls, but doesn't want her personal number showing up on anyone's caller ID. I told her that she could spoof her job number, but I don't know how to do it.
By the way, she has an att android.

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curiosi · 61-69, F

*67 Dial that code before the phone number, and it will deactivate caller ID. On the receiving end, caller ID will usually display “private number” because it has been blocked.

sweetiepoo · 36-40, F

@curiosi thanks, the only thing with that is that most people don't answer blocked numbers, so it would be ideal just to have it show up as the office number.

curiosi · 61-69, F

@sweetiepoo I don't answer calls that I don't recognize the number either.

sweetiepoo · 36-40, F

@curiosi Yeah, I know, but this is the office number, so it's the same number that will come up when she makes calls from the office.