My question would be what "full functionality" means. In your post, you got errors because of the wrong android version not supporting the app. That can be resolved by upgrading the OS (ie custom rom). You mentioned that calls/txts worked but I wasnt clear on data. Were you on wifi or did you actually connect to the cell network. You mentioned you needed apn settings. Arent those needed for data to work too?
If you can just connect to data TM and/or S, that's alot right there. Sure you don't get "full functionality" and kinda defeats the purpose of Project FI, but it might be good if one only cares about T-mobile coverage OR sprint coverage and not both and their only reason for getting Project Fi is the pricing plan or international use.
I'm also curious if I could sign up for fi, try it in some other phone to test, the cancel. I know you can pause your service but I dont know what happens with your GV#.
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"full functionality" = my question also.
calls/texts worked utilizing T-Mobile network. didn't have access to T-M apn settings right then. to lazy to look. S signal stinks in my area.
was connected to local wi-fi so it had a data connection. don't know if it used it for calls. suspect not. apn settings are needed for data from T-M ...unless it's done purely on the back-end, which I doubt.
yoiur correct that if T-M or S has a great signal: who cares about switching? well I read somewhere that Google disrupted the poster's service after a time trying it out. So apparently they care. want to use their phones...in a way I understand. It's like beta and imagine many phones utilizing Fi and the support headaches...it could happen but later i suspect.