wants to call my phone and get a verification code for me to text back .  as soon as i said cash only no shipping  they asked why.. so i sent one more text that said yeah  this number is black listed as fraudulent. never heard back from them

Just as the first person said, this number is a scam. They respond to your ad on craigslist and want you to verify your number before asking you to ship it to Nigeria. Do not respond if you receive a text/call from this number. You can tell it's fake because the message you get is usually always the same no matter how many items you put up.

Calls offering to buy your item off of  craigslist and wants you to ship bought item to nigeria.
Scam