How often can you change your Unlimited calling to any 5 numbers?

So Verizon gives you unlimited calling 5 numbers with any network, but how often can you change them. I know that with tmobile you can change whenever you want, does it work the same with Verizon?How often can you change your Unlimited calling to any 5 numbers?
with t-mobile you can change them whenever you want but only ONCE a month. If you could change them at any time and as often as you wanted to you would never use any minutes.How often can you change your Unlimited calling to any 5 numbers?
Actually with Tmobile you can only change each of the five once a month. Verizon lets you change them whenever you want you have no limit. Big difference eh?
Yes Verizon is same as Tmobile but you have to wait 24 hours activation for new number you just added .