As an answer to AT&T's NumberSync feature, T-Mobile has unveiled a new feature that allows its customers to use a single phone number on several connected devices. T-Mobile is calling its version of the technology Digits.

T-Mobile announced that it is rolling out Digits as a limited and opt-in beta feature for interested customers, according to The Verge. The company plans to release the feature to all of its customers by next year.

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In a press release, T-Mobile wrote, "You can make and take calls and texts on whatever device is most convenient. Just log in and bam, your call history, messages and even voicemail are all there."

Once the feature is rolled out to all of its customers, T-Mobile said that Digits will cost extra per month. However, the company has yet to revealed the official pricing of the feature. T-Mobile Chief Operations Officer Mike Sievert said that the Digits feature will not be treated as adding a new line in users account.

Aside from allowing users to use a single phone number on multiple devices, T-Mobile Digits also has one interesting feature: the option to have multiple phone numbers on one device. Based on the promotional video released by T-Mobile, Digits will allow users to swap different phone numbers without the need to open a new line or account.

Despite the nifty features of the T-Mobile Digits, it has one big hurdle: it does not work with Apple's iMessage app. T-Mobile is encouraging Digits users to turn off Apple's iMessage platform to get the smoothest service. This one hurdle will prove to be a major factor for the adoption of Digits to some customers, especially those who use the iMessage platform.

T-Mobile said that only postpaid accounts are eligible to try Digits. According to USA Today, the beta version of Digits is compatible with devices running on Android 5.0 Lollipop and newer versions, and iOS 9 and newer versions for Apple. Digits will also run on Chrome and Firefox browsers for desktop.