Does iPhone 4 work on both GSM and CDMA networks?

Can iPhone 4 also work oversea (not in USA)?

Added (1). Can I take my Verizon iPhone 4 (CDMA) to work on Europe GSM network? Does Verizon iPhone 4 take GSM's chip so that I can insert a chip when I travel oversea?

Added (2). Can I take my Verizon iPhone 4 (CDMA) to work on Europe GSM network? Does Verizon iPhone 4 take GSM's chip so that I can insert a chip when I travel oversea?

Yes it works on both anywhere

I bought a straight talk iphone 6 with CDMAcan this phone use on a gsm network?

I bought a straight talk iphone 6 with CDMAcan this phone use on a gsm network?

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