A comparison of the headphone jacks (from top to bottom): Wi-Fi, CDMA, and GSM.

By and by, the headphone jacks are identical, with the exception of the GSM version which houses a microSIM card slot.

Since the CDMA version has no microSIM card slot, it actually uses the exact same headphone jack assembly as the Wi-Fi version.

Astute readers will also notice the GSM's headphone jack missing. It paid the ultimate sacrifice for our iPad 2 headphone jack article.