We've seen a few apps and services offer virtual phone numbers before - numbers that aren't tied to a specific SIM card and can be used with an account connection rather than dedicated hardware. It's especially handy for bring-your-own-device situations at work. But T-Mobile seems to be the first major American carrier to embrace the idea with its new DIGITS system. The service allows customers to use any number of, um, numbers tied to their wireless accounts, including disposable numbers that can be added and abandoned with ease.

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