You should check to make sure that ooma has a number in an area code that is local to your ratecenter.
You can cancel your verizon service anytime after you get your new number.
Make sure you are not under a contract with verizon and that there are no early termination fees!
Telo with 2 Handsets, a Linx, and a Safety Phone
Telo2 with 2 Handsets and a Linx
If you don't have Premier, I think you'll have to contact support to have them assign a number.
In either case, you'll have to contact support in order to have them re-configure your Ooma to not use the landline.
Here's more info: http://cp-ooma.talismaonline.com/articl ... 19&p=12040
Or you can go here to see if they can port your number or they have a number in your area: https://www.ooma.com/did_search-popup.php
If you can and want to port your existing number, in the lounge, select add-ons and number port. The porting fee is $39.99 or you can sign up for a yearly subscription of premier for $99.99 and get the port included.
Like murphy said, if you have DSL, it's a more involved process to port or cancel your landline, so you don't lose DSL.