I was reading this article called Twenty Five Little Known Telephone Tips for Private Investigators and when I read tip #16 I decided to give it a try so I called the first number which is to the MCI Network and MCI's Network said that their Caller ID said that I was calling from number (214) 446-0482. So I hung up and called right back and this time the MCI Network gave me my correct phone number. So I waited a couple of hours and called the MCI network number again and again their Caller ID said that I was calling from (214) 446-0482 I hung up and called right back and again I was given my correct number again. I have pasted a copy of tip #16 below.
"Know The Number You Are Dialing From" Tip Sixteen:
These are known as ANAC numbers which are used by telephone repair people. Here are some national ones certainly reported. 800-444-4444, 888-324-8686, 800-444-3333, 800-727-5207, 800-555-1160.