my parents just got two of these and I'm an iphone owner myself, but I have some android experience.
Anyway, when I send a text I get the error message "service not available" the details show "cause code:97 error class: 3"
and when I click the email button on the button and try to set up gmail (gmail works fine through the browser or to download from play) I get another error that says "Warning 503 80383: pin expired" I messed around with my dads for like two hours last night and finally got it to say something different, but still stopped here.
as far as I can tell these are the only two features that aren't working properly.
they have unlimited texting, although they've never had texting on their phones before now.