T-Mobile plans to roll out a service similar to AT&T's NumberSync at some point, according to CTO Mike Sievert. "What we are working on will make this version one offering from AT&T look small," said Sievert to Re/code. "Our strategy is to ask customers what they want and need, and then build it. AT&T's is to build or buy things, and then try to convince customers they asked for it." NumberSync, from AT&T, will let customers use a single number across multiple devices, such as phones, tablets, and smartwatches. The basic principle is to make it easy for people with multiple devices in a single account use them all for calls and messaging. AT&T's NumberSync will arrive later this month. T-Mobile didn't say when it's version of this feature will arrive.


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