I have several devices including iPhone XS, a few Android devices, and a hotspot; each with its own number. How many devices do you support per account? Do you

I have several devices including iPhone XS, a few Android devices, and a hotspot; each with its own number. How many devices do you support per account? Do you have an unlimited account and what sort of bandwidth limits do you have? I live in Houston, TX. My current carrier is T-mobile. I'm fairly satisfied with cell service where I live, but my parents' home an hour away is garbage. How's your coverage there? In addition to leaving my devices in do-not-disturb mode, I also specifically disable my voicemail. I am not interested in voicemail messages and have repeatedly asked to have T-mobile permanently disable it for my phones but it keeps turning up anyway. Is Community Phone able to resolve that? What I would rather have would be if voicemail and other messages could be delivered directly to a personal email address and/or posted to a personal file server. I want to be able to aggregate my phone numbers' correspondence in any standard desktop mail client like Thunderbird.