definitely some downsides to this service:

-inserts ads

-your users must signup via the zeep mobile panel

-all messages are sent and received from the zeep shortcode

that being said, there are no volume restrictions, and free is a powerful motivator, especially for side projects or hobby apps.

It will be interesting to see how the economics of that one shake out. Even if Zeep is down to 1 cent per SMS, that's still a $10 cpm just to get even.

asking the user to sign up with zeep!...dont know how many users would be comfortable with giving away their phone number to a third party

Cliff's notes catch:

"..in order to monetize the service, it will insert ads into the SMS messages."