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 0W-20 is my drug of choice.
Primary: iPhone 7 Plus, Galaxy Note 5, LG V20
Secondary: TracFones: iPhone 6s [AT&T] & iPhone 7 [Verizon]
Mobile Broadband: ZTE Z915 LTE hotspot (5GB for $10) + iPad Mini 4 w/ T-Mobile LTE