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So like others I purchased this little box to get rid of my $20 bill to Verizon for a home phone that mostly sits there due to the fact that we have cellphones but still want a "landline" style phone system just in case everyone's phone is on silent and there's an emergency. The obihai has worked mostly flawlessly with a couple of hiccups disconnecting from the internet and even one time having to be unplugged so it could reconnect. The one flaw other than having to pay a small fee for 911 service is that you can't circumvent Google's voice mail and have your home answering machine take your messages. I don't know if this is more of an issue on Google's side of the house or what, but sometimes, due to internet lag or whatever, the phone in our home may only ring once or twice, not giving us enough time to answer a call before Google's service redirects the caller to VM. Super annoying! I bought a fancy Panasonic phone systems for our home before I realized this. 5 stars if Obihai can work something out with Google to fix this as we miss about 50% of our calls.
I liked the hardware. The user interface was as good as any and what I could get working worked great. The support folks were fine, if and when you could reach them. I spent several hours listening to elevator music waiting for a support person. I think they must only have one very over-worked guy. Average wait time was 45+ minutes and over an hour on more than one occasion.
But in the end, the problem for me was not the hardware or the support. The problem is that the OBi202 uses several ports to provision it's unique functionality and those ports are not available with the T-Mobile Home Internet LTE Gateway Solution. I don't know if and when OBi and T-Mobile will work that out. But as of 1/25/2021, don't bother to try the OBi202 if you are on T-Mobile Home Internet. You can VPN the connection and pass it through, but the overhead is too high for VoIP.