How do you spoof phone numbers?

@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.

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

@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.

@sweetiepoo Then apparently the practice is considered illegal, which is why you are unable to find information on how to do it.

@xixgun It's legal. I've read for the purposes we are intending to do it for were 100% legal. We are not trying to spam anyone, trick anyone, collect money or whatever. But because of the covid-19, my sis has to work from home. Calls that she usually makes from the office, she has to use her personal phone. So, because she doesn't want her personal number showing up on caller IDs, I said that she could have the office number display instead. I just don't know how to do it and naily what I found were 3rd party apps, I didn't know if there was another way. Thanks anyway.

@sweetiepoo Well, you could always contact mom's cell provider as they sometimes offer a "second line" on the same number for business, etc.