Update unlocked T-Mobile to Marshmallow

[TylerLV76]

I'm debating grabbing an unlocked T-mobile note 5 that still has lollipop on it and using it on At&t. I know I cant do OTA updates so I have to manually update it. My question is, do I just plug the phone into my pc and run smart switch and hope it detects an update available? If it does update will it affect the phone being permanently unlocked?

I've tried to search for as much info as possible but are there any limitations using a T-Mobile Note 5 on At&t?

 

[anon(632115)]

OK, you should be able to update it with Smart Switch. THis won't affect the sim unlock but it may not work well on 4g with AT&T as it doesn't handle all of the channels AT&T use

 

[TylerLV76]

...but it may not work well on 4g with AT&T as it doesn't handle all of the channels AT&T use

This is what concerns me a bit. Ive read mms may not work properly as well while connected to wifi.

 

[thebear]

Here are some if the things I've run into when using a tmobile unlocked LG v10 on AT&T. I doubt there is much diff with note 5.
In order for my v10 to get lte I had to put my sim into a working AT&T phone and get lte working in it then put that sim back into v10. lte has been rock solid since. My wife's iPhone and my son's nexus didn't have this issue.
AT&T doesn't allow non branded phones to use volte or wifi calling features
To my surprise I received an OTA update on my T-Mobile v10 while running on At&t network.
My over experience has been good though I'm tempted to get a note 5 to replace the v10. I loved my note 4 with the spen, but I love the extra battery on v10. Decisions.

 

[TylerLV76]

I decided it wasnt worth dealing with the hassle and bought a note 7.