Yes, as libra89 says if you wait for the T-Mobile release everything (presumably) will work, while if you go to Insider now certain features won't work until you get the T-Mobile firmware. When the T-Mobile firmware comes those features should be fixed, and being on Insider should not interfere with getting the firmware, per Microsoft. So the question is did you wait this long because you wanted a stable build of Windows 10, or did you wait because you want to update once and have everything work? If the former, .164 has been great for me. If the latter, wait a little longer for T-Mobile, I guess.