Porting or parking cell phone numbers

Have a business cell now and want to keep hold my old personal cell number but not pay for the service. Has anyone ported or parked a number? I'm looking at a service like Tossable Digits or similar. It would be several dollars a month instead of 50-60?

You could always port it to an IP phone....and pick up the call anywhere.

I have Ooma from when I ported my house phone - now I just mainly use VMail and not the phone.
 
(not sure if that's what you're looking at exactly)
 
...or...you can have your provider put a hold on your account and number if I recall.