T-Mobile said its Digits service, first announced last year, will go live May 31. Digits allows customers to use the same phone number across multiple devices, or multiple numbers on a single device. The service operates over LTE and works with most connected devices, including phones, tablets, wearables, and computers. Digits relies on an app for Android and iOS devices, though T-Mobile says Digits is also built into the native dialer on certain Samsung phones (Galaxy S6, S6 edge, S6 edge +, S7, S7 edge, S8, S8+, Note 5) and the LG G5. T-Mobile customers sign in on whichever device is most convenient in order to access to their phone number, voicemail, text messages, and call history. The service allows a single smartphone to support up to five phone numbers without requiring additional SIM cards. Similarly, a single Digits number can be used across as many as five separate devices. T-Mobile has been beta testing the service since early this year and says the ability to send text messages from PCs is a favorite amongst early adopters. T-Mobile suggests Digits could be beneficial to business customers, as it would allow them to have their personal number and work number ring the same phone, negating the need to carry a second handset. It can serve families, too, allowing landline-based home phone numbers moved to T-Mobile to ring all devices on a family plan at the same time. Digits numbers can be assigned to run on AT&T, Sprint, and Verizon phones through the Digits app. T-Mobile said every T-Mobile line will be upgraded to Digits on May 31 for free. A single Digits line can be used on customers' phones, tablets, and so on. New Digits lines added to an existing account (for example, a second number for one phone) cost $10 per month. For a limited time, customers who subscribe to the T-Mobile One Plus plan will be able to add a second Digits line at no extra cost. T-Mobile warns that Digits lines support 911 calls and texts, but reaching 911 via the main account line is best. Further information may be found at the official DIGITS site.