A1429 is an INTERNATIONAL model. It is actually better than A1428, since it is designed to work in Asia/Europe/Central and Latin America. It is a DUAL BAND CDMA/GSM
Model A1429 – CDMA/GSM Global Model
This iPhone is the one that CDMA carriers and all European and Asian carriers will sell. Like Model A1428, it supports quad-band GSM and quad-band UMTS with single cell and dual cell HSPA+ modes. This model trades in support for LTE band classes 2, 4, 5, and 17 for LTE band classes 1 (IMT, 2.1GHz), 3 (DCS, 1.8GHz), 5 (Cellular 850, 850MHz), 13 (Upper 700MHz C block), and 25 (US Extended PCS, 1.9GHz). Additionally, it supports CDMA2000 on band classes 0 (Cellular 850, 850MHz), 1 (PCS, 1.9GHz), 10 (ESMR 800, 800MHz), and 6 (IMT, 2.1GHz).
I bought mine last night, it is A1429 CDMA.
A1429 CDMA model
Source - I got all the answers from Straight Talk earlier.
The are listing both, you need go to the store and look the iPhone box to be sure, I did not buy online at less have an option to choose.