How do I keep my personal cell phone number, but have the calls and text messages come to my work phone?

Here’s the scenario: I just started a new job and they have provided me a new phone but would not let me use my personal number. I don’t want to carry two phones around and I don’t want to train everyone to call/text my new number just to have to do it all over again in a few years if I change jobs.

Google voice is almost exactly what I want, but they don’t allow you to port your current number.

Is there another service/option I am missing?

Thanks in advance.