For people who juggle multiple devices, this could make life easier by making it so that they no longer have to give out numerous phone numbers. And users won't need to do anything to make it happen; T-Mobile said it will add DIGITS capabilities to its customers' existing lines automatically.

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Another feature of DIGITS is that users will be able to associate the same device with multiple phone numbers. So, for example, if you want to keep work and personal life separate but still receive both types of calls on the same phone, you can sign up for an additional phone number and give that one out to your professional contacts while reserving your original phone number for close friends and family.

T-Mobile is charging an extra $10 per month for each additional phone number, though customers who are on the T-Mobile One Plus plan are temporarily being offered one extra phone number for free. This could come in handy if you intend to use a DIGITS number like a throwaway email address to protect your privacy — giving it out whenever you're dealing with someone you might not fully trust with your personal data.

As more Americans turn to smart, connected devices for everyday tasks, some are also having to make sure that any work they do on one of them gets reflected across all of them. Universal phone numbers that work across devices can help us keep track of our gadgets — and allow us to get creative with our communications strategies.

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