if the iphone under settings, general, about has IMEI only, it is a GSM carrier iphone, but if it has an MEID number as well, then it is a CDMA (verizon or sprint ...
From MoVoltage MoPower
Verizon IMEI cleaning available at IMEIRescue.com! Fix your blacklisted Verizon device today so you can start using your mobile device again! All services ...
From IMEI Rescue: To The Rescue
Free iPhone Blacklist Check https://idevicehacks.com Free ESN & IMEI Blacklist Check Service for T-Mobile, AT&T, Sprint, MetroPCS, Verizon, Tracfone and ...
http://www.cricketusers.com How to check for bad ESNs. Check if the ESN on a cell phone is bad for Sprint, Verizon, MetroPCS, StraightTalk, or Cricket.
From Cricket Users Forum
If you have a Verizon phone with bad ESN that's reported lost, stolen or missing, get it fixed here: http://www.esnfixer.com.
From iPhone Repair