OK all, here is another verified app I use on my Axon Pro.
When I received my Axon with Android 5.1.1 I noticed that the stock messaging and contacts app has some features missing.
With a previous phone I was able to assign ringtones to individualize my contacts. I was also able to assign different notification sounds, wallpapers and notification colors (that phone had a breathing LED so I was also able to assign colors) to the messaging app. Because this was not a feature on the Axon I searched and searched for an app that could allow me to customize further my contacts. Finally I found this app Contacts+.
Once I installed it I was able to apply my customization.
I added ringtones to my contacts to individualize them so I can recognize who was calling me when and if they did.
Also I added different wallpapers, SMS notification sounds to messaging, but since the Axon Pro does not have a breathable LED, I omitted that.
I've added pictures of some of the options.
SMS Customization. Wall Paper first. my mom is a little spiritual I only added this to show the customization of the wall paper. If it offends anyone, I apologize.
Now some of the options for SMS
My main point is that I have verified it works and although I have had some difficulties I have submitted feedback and an update gets pushed out shortly thereafter.
I did purchase the upgrade so it has some other perks with it.
Perks include: Themes, Backup, Priority Support, block numbers, App Lock and Merging Duplicates that one right there came in handy.
I'd like to thank you for your time reading my comments and opinions.