Following is a summary of details of that article that Jeff helpfully provided, where my comments are in the order stated in the article.
They switched a husband and wife from T-Mobile to Google Fi, where the guy wrote about his experience.
Once they received the Google SIM card, they said it was simple except for Google Voice (which used conflicting technology), but the guy worked around the GV issues.
They said it uses only the Sprint, T-Mobile, & (encrypted on) public Wi-Fi networks, which, for me, means T-Mobile since none of the others exist in quantity where I go. And T-Mobile sucks, but no more so than does Verizon or AT&T where I live. In the valley, they're all good.
They said they saved money on Google data by making phone calls over the public WiFi networks, but that they never knew *when* they were on public WiFi (which means they didn't really check it out for sure).
Besides, why not just make those "unlimited" calls and texts over the T-Mobile or Sprint network, which shouldn't *use* data in the first place?
Anyway, they did say there are the obligatory taxes and fees of about "four bucks and change" per phone line.
In the end, just like I had roughly calculated, he paid almost *exactly* what he had paid on T-Mobile (only he had a limited number of calls on his T-Mobile plan, while I have unlimited).
With the four bucks in taxes added, he averaged $32.23/month, while his wife averaged $29.05 a month, which I'll just call 30 bucks a month per phone, which is *more* than I'm paying now for unlimited calls and texts and 3.5GB of data per phone for 4 phones with T-Mobile.
He then discussed International Roaming (which my plan with T-Mobile also has, and, in fact, is *why* I moved from $60 for 4 phones to $100 for 4 phones since we travel to Europe for at least a month or two every year).
He did describe a *data-only* SIM, much like the free 200MB/month T-Mobile data-only SIM that I have in my tablets, where the cost is $10/GB to Google. This is a nice option for those who need data on their tablets over the free amount provided by T-Mobile to anyone who asks for it in the USA.
He liked the Fi customer support and the voicemail.
Near the end, he said Google Fi is probably not for you unless you use at
*lot* of data (between 1GB and 3GB).He said the primary concern is the T-Mobile coverage, as the WiFi is bogus (my words) in that you can never depend on public WiFi coverage. This is the same concern with my current plan, which is 20% cheaper than Google Fi, for just about the same service (even if I had one of the 3 phones it works with).
In summary, his costs are 20% higher than mine, and, his coverage is essentially the same.
Doesn't sound like a good deal for me - but YMMV if you're a heavy data user, which I'm not.
The only part of the article that I didn't completely understands was how the public WiFi was gonna save him money on *calls* and *texts*. I can easily see how it saves money on data - but calls and texts?