Do I have to jailbreak my iPhone 4 CDMA from Sprint to get it to work on T-Mobile?

Okay, I have this Sprint iPhone 4 8 GB that does NOT have a SIM card tray. At the time, when I bought it, I was completely unaware that I was supposed to have an IMEI code to unlock it. Yes, I was an idiot and now I'm stuck. Is there ANY way I could unlock it so I can use it on the T-Mobile network? I was skeptical about it but I still want to know if there's any other way and if it is possible.

Nothing you could do will get a CDMA iPhone 4 to work on a GSM T-Mobile.

"At the time, when I bought it, I was completely unaware that I was supposed to have an IMEI code to unlock it."
--All phones have IMEI codes, so that's not the issue.

Jailbreaking & unlocking are 2 different things, but again, nothing in this case will help.

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