Can i take my sprint iphone 4s and change it to straight talk?

Iphone was a contract phone from sprint

IPhone from Sprint is a CDMA phone. Until recently I was under the impression that CDMA phones can't be used on Straight Talk. More recently, however, I saw new Straight Talk ads for the Bring Your Own Phone (BYOP) program.So, I checked with the Straight Talk website, which has a nice feature that allows one to input their phone's EIN/MEIN, and the site will tell you if the phone may be ported over to Straight Talk service. Specifically, my Sprint iPhone 4S is portable. In order to do this, one must pay around $15.00 for an activation code, rather than a SIM card, to port a CDMA phone to Straight Talk.

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