Can I keep my T-mobile number if I switch companies?

[miss d]

I want to get Boost Mobile and I really want to keep my existing phone number for multiple reasons, has anyone had experience with keeping their numbers the same? I called Boost and they said I need my account number and some kind of pin, and a while ago I called T-moblie asking about it and a representative told me that all I had to do was just tell the provider I want to switch to that I want to keep my number from them and that was all...