[Animats]

Doesn't look good. Remember, you're giving this unknown business the power to snoop on your phone calls. Do you want to open that back door?

No visible privacy policy. No visible pricing information. Not good.

Twilio can do this without any help from these guys.[https://www.twilio.com/labs/twimlets].

[ramya_raghu]

I built my Call Forwarding app using Plivo. It was pretty straight forward to use. https://www.plivo.com/docs/getting-started/forward-an-incomi... is their official documentation on Call Forwarding. Also, every user gets a pre-built Call Forwarding which requires you just add the numbers for testing which looks like this - http://callforward.herokuapp.com/forward/?Numbers=NUMBER_1_H...

[sushid]

More importantly, why would you want to call your "real" numbers sequentially by default? You might prefer hitting all of them simultaneously, which is also trivial as everyone else here has mentioned.

https://www.twilio.com/blog/2009/05/dialing-multiple-numbers...

[Falling3]

That's my first thought. Why not just do it yourself? Especially when twimlets are around.