Update: Marshmallow has been running quite well on our two Note Edges. Haven't noticed any difference good or bad on battery life. Overall operation seems smooth and responsive.
The only issue we had was getting the new Video Calling feature (which is embedded into the Stock Phone Dialer) to work properly.
The new Video Button (near the Phone Button) is gray, unless you AND your Contact has the following:
- a) use AT&T as their Service Provider (your Plan needs to meet certain requirements too).
- b) be in an HD Voice coverage area OR on WiFi (see AT&T's web site for HD Voice coverage areas)
- c) Each phone needs to be running Marshmallow 6 AND have the Video Call button available
- d) Settings / Connections / Wi-Fi Calling: Enabled NOTE: this routine took a couple of passes through the various dialogs.
- e) Settings / Connections / MoreNetworks / MobileData: Enable both Mobile Data and Enhanced LTE Services
- f) Settings / Connections / Data Usage: This may/may not need to be disabled (our's are disabled).
- g) PhoneDialer/Menu (three dots in upper-right) / Settings / Call: Enable Video Call
At that point, your Contact's Video Button SHOULD be a solid green and you can initiate a Video Call.
HERE IS THE KEY: AT&T needs to make sure that your SERVICE is PROVISIONED for Video Calling on ALL of your phones! (then restart your phone)
Video Calling was working on one of our phones, but not the other. Confirmed all settings on both phones. Final test was swapping SIM Cards: Video Calling then worked on the other phone. Called AT&T. Their first-level support was not able to make the change. Second level support called us back the next day, made the change, then all was good! So, have this discussion with AT&T if your Video Calling is not working
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