"Your friends need an ostel account too. To ensure your call security, ostel
service cannot make calls to land lines or SIM card phone numbers on cellular
networks."
It is something, but not a full solution. It is not practical for me to
contact any person or business I may want to call and make sure they are set
up with ostel first, before we can talk on the phone!
It looks useful if most of your friends and family have mobile phones, with
data plans, who are willing to install the app, and sign up with ostel.
In my case, I already have some family and friends with flip phones without
data plans, and some who use land line phones much more than their mobile
phones.
The technology exists already. I could use Ooma, but I don't want to use
non-free software. If only there were a Libre Ooma!
