Do the secondary device like Gear S2 need to have active service?

superflysocal

    I want to do 1 number multiple device with the Gear S2 being a second device.  However, I currently do not have service on the Gear S2 (it is a Tmobile version of Gear S2). I just have Tmobile service on my regular cell phone (Note Edge). Will I be able to use it as my secondary device on DIGITS or do I need to pay for service on it already to use it as secondary device?

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