GrandCentral to Google Voice: Free calls to USA and $1 for free trial international calls and SMS

After acquiring GrandCentral few years ago, Google launched its new VoIP international calling service with the brand name of Google voice. However this service is not open to new users, but if you already have GrandCentral account, you can upgrade your GrandCentral account to Google voice account. To upgrade your account to Google Voice, just log in to your GrandCentral account and follow the