T-Mobile’s “Digits” program revamps the phone number

On May 31 T-Mobile will launch Digits, a revamp of how T-Mobile phone numbers work, virtualizing customer numbers so they can work across multiple devices.

It sounds a lot like Google Voice—rather than having a phone number tied to a single SIM card or a device, numbers are now account-based, and you can "log in" to your phone number on several devices. T-Mobile says the new phone number system will work "across virtually all connected devices," allowing multiple phones, tablets, and PCs to get texts and calls. This means T-Mobile needs apps across all those platforms, with the press release citing "native seamless integration" in Samsung Android phones, Android and iOS apps, and a browser interface for PCs. The new phone number system is free to all T-Mobile customers. Customers can also buy an extra phone number for $10 or by signing up to the $5-per-month "T-Mobile One Plus" package, which is a bundle of extra features like a mobile hotspot and in-flight Wi-Fi. Here, the "extra number" use case matches what Google Voice users have been doing for years: a personal and business number, or a number to give to online sales sites like Craigslist, or an easily dumpable number for your Tinder dates.