If it doesn't show a phone number (the last four digits that it does show, are probably the last four digits of your MEID/serial number) - then like Lisme said, you need to program the phone. No phone number = not programmed = won't work for calls/text/data.
Let us know if it worked!
Castrol EDGE 5W-30 is my drug of choice.
Primary: iPhone 6 64GB, Galaxy Note 3, Galaxy Avant: 5 lines, 3x $5 Android web, 1x $2.99 T-Zones, corp discount + $10/mo loyalty discount = $93/mo tax inclusive
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Mobile Broadband: ZTE Z915 LTE hotspot (5GB for $10) + iPad Mini Retina w/ T-Mobile LTE