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No its not possible sadly magentamanig. If you have a Verizon device with the Verizon sim card, in that you can install DIGITS app from Play Store or App store and then use your T-Mobile number in that device. But the other way around is NOT possible i.e. bringing or using your Verizon number on to your T-Mobile device.
DIGITS can only help you to use your T-Mobile number(s) on multiple devices but it does not concern with any other service provider.
I see, thank You for your response !