Today T-Mobile USA announced the launch of Digits, a free service that lets you make and receive calls and messages using your T-Mobile number from most of your internet connected devices. According to T-Mobile, Digits will be available to all T-Mobile customers on May 31, 2017. Hopefully "all T-Mobile customers" includes those of us on T-Mobile Prepaid, but T-Mobile didn't explicitly say that so we won't know for sure until the 31st. There are two parts to Digits. The first part that lets you use your T-Mobile number to make and receive calls and messages with all your devices is free. The second part lets you create up to five additional Digits virtual numbers. The additional numbers can be used for calling and messaging with any or all of your Digits phones. T-Mobile One Plus postpaid customers get a second Digits number for free, for the rest of us additional numbers cost $10/month. Digits is built into the T-Mobile versions of the Samsung Galaxy S8, S8+, Galaxy S7, S7 edge, Galaxy S6, S6 edge, S6 edge+, and Galaxy Note 5. Android and iOS apps are available for other phones. There's also a web app that works with the Chrome and Firefox PC browsers. You need at least one T-Mobile phone and phone number to use Digits, but additional Digits phones tablets and PC just need an internet connection and do not have to be on T-Mobile. Digits calls to T-Mobile phones are normal circuit switched or VoLTE calls. Calls to or from other non-T-Mobile phones or WiFi connected devices are VoIP. I suspect that if you're not on a T-Mobile unlimited talk and text plan Digits calls and messages made using PCs and non-T-Mobile devices will count against you calling or messaging limits like T-Mobile WiFi calling does. The basic Digits service sounds like a good alternative to Google Voice for the Google adverse. Like Voice, it will allow you to use a single number on all your devices, handy if you have multiple phones. Like Voice, it also lets you make and receive calls, SMS and MMS from a PC. Additional Digits virtual numbers could eliminate the need for some of us to carry two phones, such as one for business and the other for personal use. They could even be used as temporary disposable numbers for calling or texting services you suspect will SPAM you, although $10 seems a little pricey for a single use number. To sign up for Digits, visit www.t-mobile.com/getDIGITS starting May 31.