What's that app called?!

I have an iPhone and I used to have an app that was for when you make an ad (like on craigslist) it gives you a number so that people can call you on that number instead of your personal number and you can 'disconnect' it or whatever whenever you are done with your ad being posted. Does anyone know what the hell I'm talking about?! Lol. Thanks in advance.

you can do that with google..

text now gives you a number with your area code. You can text and make/recieve calls. Change the number whenever you want.