From time to time, I check my phone to see if there's a 5.1.1 update awaiting. Nothing. So I called Customer Service just now. They don't have a clue, either. It's a mystery. I'm thinking they could be waiting for 6.0 (Marshmallow)...but that doesn't sound reasonable, either. The question is why would TMO release the latest produced Note 4s with 5.1.1 (910T3) and not push it out to earlier produced phones (910T). Aren't they the same? Is there something they're not telling us about the earlier phones that are stuck on 5.0.1? Wouldn't you think the same basic phones would be able to handle the same software? Is there something that causes the earlier 910T not to function properly on 5.1.1? Nobody at TMO either doesn't know or won't tell us. Makes me more than a little suspicious...and disrespected. It's become a non-issue for me lately, since I'm switching to the Moto X Pure Edition as soon as it arrives in my hot little hands. But it should be an issue for those sticking with the Note 4 (910T).