I have several theories as to why T-Mobile hasn't released Lollypop for the Note 4...yet. One theory...and I hope this is true...is that they're going to release the 5.1 upgrade rather than start at 5.0 and later release 5.0.2 and 5.1 in the future. My other theory is that they have to modify it (again, hopefully, 5.1) to operate properly with the Gear S. Otherwise, I don't really see any other reasonable explanations for this delay, since TMO won't offer any explanations. If anyone else has other theories (or even direct info), I'd sure like to hear them.