- Decoupled phone number — when your number is decoupled from your wireless carrier or SIM card, you can change carriers whenever you want. Find the best service, best deal, best offering that matches your usage patterns, use your number internationally, etc. Also incredibly handy if you lose your phone for some reason.
- Central archive — it's surprisingly useful to have a Gmail-style archive of your SMSs, voicemails and call log.
- Free calling and texting — send and receive SMSs via mobile data (which don't count against some ridiculous cap), and make calls for free via Gmail and GrooVeIP
- Call handling — screen incoming calls, block numbers from calling and texting you, use "do not disturb," play customized greetings, etc.
- Multi-platform — use the service from Android & iOS mobile apps, a Chrome Extension, or any modern web browser.
A UX annoyance though — the service needs to keep track of read state. Currently, for example, the Chrome extension will chime to notify me that I have a new text, and I'll reply to it from within Chrome.
Meanwhile my Android phone obliviously keeps blinking at me, telling me I have a new, unread message that I've already responded to in Chrome. It should know better.