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, Lumia 635, & LG L90 and F6: 5 lines, 1x $15 5GB data, 2x $5 Android web, 1x $2.99 T-Zones, corp discount + $10/mo loyalty discount = $93/mo tax inclusive
Secondary: iPhone 4S & LG Ultimate 2: TracFone (Verizon)
Tablet: iPad Mini Retina w/ T-Mobile 4G LTE