Can I exchange my number?

No. Once you would like to have a new number you are welcome to purchase it.

https://www.groovl.com/numbers

Some information we feel will be useful for you:
—  Can I be sure that number wasn't used before?
—  How many numbers can I have under my account?
—  Reuse
—  Why is number partly masked?
—  Why my phone number is gone?
—  How to restore released number?
—  Can I exchange my number?
—  Can I have a number for one SMS only?
—  How many SMS numbers you can provide?
—  What type of phone numbers you provide?
—  Number expiration
—  Turn off auto renew