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Yeah, it looks like I may go that route. I was using SlimLP but for some reason (I can't recall why) I went stock using xposed.yeah its ancient indeed.
but i think to only stop updates you need to rom that sucker...
" No more mystery shut downs, no more "google services" battery drain. I am getting over 24 hours on a charge again and everything is running smoothly. As of today I plan on keeping the N6 "till the wheels fall off".Yep, definitely the aliens had a hand ... or whatever kind of appendages they have ... in this.

Another T-Mobile guy said definitely not because the Nexus 6 T-Mobile sold had some special hardware added. Yeah, sure it does.
yeah - that's the special pixie dust generator module.... 
I was about 90% sure that with a T-Mobile SIM it would get the T-Mobile OS version when it updated. I was just trying to get confirmation of it from them.OTA updates are based on what SIM is installed. Strange that T-mobile wasnt aware of that
I dunno. If it has the latest OS version installed it might not update solely to load a different carrier version. But no doubt this proved that when a newer OS is available it will do a carrier-specific update.Not sure how well it would have gone if it had already had one of the carrier specific OTA versions on it already though. I imagine it would still update to the proper carrier but I'm not sure if anyone has tried it.
Well, that's what I planned on doing if it didn't go as I hoped. WiFi calling and the great sale price was the main reasons for replacing my trusty Nexus 5.Another option would have been to flash the T-mobile factory image
probably the stagefright patch