Check any Sprint or Boost Mobile iPhone IMEI to see if it's clean, blacklisted or has an unpaid bill.

 Sample results:

 IMEI: 352002****38701
 Model: IPH 5S GLD 32 VMU BOX SGL
 Model Number: 885909728039
 Manufacturer: APPLE, INC
 BLACKLIST STATUS: CLEAN (FAILED DEACTIVATION)
 SPCS: YES
 Activation: NO

 OR

 IMEI: 35382****127919
 Model: INS IPH 7 BLACK 32GB SGL
 Model Number: RECIN732GBK1
 Manufacturer: APPLE, INC
 BLACKLIST STATUS: UNPAID BILLS
 ICCID: 89011201000488102599
 IMSI: 310120148810259
 SPCS: NO
 Activation: YES