I tried to sign up. I haven't get the code to my email since about 45 mins.
Also, the color palette in app (in android) can be better. I can't see anything as I type :(
I've decided for now on the limit of 1000 messages because you can always upgrade them later on and still stay in the free account. This is what I see that gives more flexibility to the customers without pushing them to subscription right away.