- Representing a person by a country-specific number is a horrible UX. All of my contact methods besides phone number remain the same no matter where I am in the world. Several of my contact methods (Facebook, LinkedIn) enable directly "dialing" my real name and intelligently locating me by social proximity instead of asking the customer to program in a stupid number (or multiple numbers) for every contact. A few (Skype, Hangouts) at least allow for alphanumeric, easy-to-remember identifiers instead of numbers. Aren't we in 2017 already?
- I want information to flow with me, not be tied to a particular device. Ideally, I should not have to carry any particular device, but rather present my credentials to any device I own (be that a computer, one of my many phones, tablets, or smartwatches). All of my contact methods besides phone number and WeChat are device-independent and align with this vision.
- E-mail replaces SMS. It supports >140 bytes. In fact, it can comfortably support several MEGAbytes per message! Isn't that mind-blowing? There is ZERO reason to continue to use a stupid old technology with a 140-byte limitation. As part of the deprecation process, I have all SMS go to my e-mail inbox instead of using the SMS interface on the phone.
- I don't take unscheduled voice calls. In general, if my day is going as planned, 95% of the time I am doing something where I shouldn't be picking up a phone (either for my own safety or due to etiquette). That includes machining metal, having dinner with real people, listening to concerts, meditating, coding, hiking (usually without reception), biking, whatever. Unscheduled voice calls are incompatible with my lifestyle.
- When scheduled, I do video calls more often than phone calls.
As such I'm totally fine with a phone app being third-party. A phone number is not the main reason I have an LTE device in my pocket.
In fact, of my multiple LTE-capable devices, only one is capable of receiving phone number calls. The rest have data-only SIMs.