Yes. The monthly plan is $79 (local) or $99 (toll free). The buyout is the prepay of whatever’s left of a 48 month term, so the maximum buyout is $3,792 for a local number if you buy out in month one. After that, you own the number with no strings.
It works like buying an unlocked cell phone. You can take it to any phone company you want. We transfer the number to your own account at NumberBarn, and you can keep it there or move it to any other carrier at your convenience. As long as you keep it active, the number is yours.