The more expensive the plan, the more people you can talk to simultaneously. In other words, the PTT and group chat is capped at a certain maximum number of participants depending on the plan you're on.
In the next step you and and one or more teammates of your choice will get a text message to install the Sonica app from the iTunes or Google Play stores so you can try out the features together. If you like what you see, you can then use the team deployment wizard to add more people to your team.
Yes. If you pay annually you get a 20% discount. You can choose the annual payment option inside your web account which you will see after you start your free trial.
If you're on a paid plan, charges occur monthly by default. You always get the free trial period at no charge, and at any time during or after your trial you can provide your credit card number to maintain the plan you selected.
That's fine. You'll be downgraded to the freelancer (FREE) plan after your trial period is over. All team data and groups remains intact.
No, Sonica is an OTT app which means it works on top of your current cell phone data connection or Wifi.