two phones into one?

[leginatl]

okay. I have an AT&T iPhone 4S I use for both hm and wk. My boss recently bought me a Verizon plan iPhone 6 plus. What is the best way to "forward" calls from the old phone to the new/work phone (don't want to carry both). I don't want to get rid of the old number on my 4S. This is "supposed" to be a separate work phone but seems ridiculous to have 2 phones. Someone said something about putting the 4S sim card into my new 6Plus, but doesn't that then put that phone onto the ATT plan??? help. Or I have heard you can forward calls from one (the 4S) to the 6Plus????

 

[Baldwin22]

first, copy your old number as a file on your computer, then downlod it to your iphone 6