HT3939 if I purchased iPhone 5 GSM A1429, then I tried to use CDMA SIM card inside the same phone, does it'll work and provide me signals ???

Hi All,
Regarding iPhone 5, at the latest model, if I bought an unlocked one from UK Apple Store,  iPhone 5 GSM   A1429, then I tried to use CDMA SIM card inside the same phone, does it'll work and provide me signals or not. ??
Thanks for your answering.

The answer is complicated. None of the major carriers offer PAYG service in the US, but if you buy a contract-free phone for full price you can get a plan that can be canceled at any time from any of the major carriers (AT&T, Verizon, Sprint and T-Mobile). There are smaller resellers that offer PAYG service (StraightTalk, for example), but they are hard to deal with.
The most liberal is the GSM carrier T-Mobile. They have "unbundled" the phone from the service, so if you bring your own phone or pay full price for a phone the monthly cost will be lower.
The other 3 will charge you the same monthly cost whether you pay full price for the phone or get a subsidized phone.
Verizon iPhone 5 series phones are unlocked out of the box for international use (thanks to a condition the FCC imposed on Verizon when they were allowed to buy a substantial chunk of spectrum). They are the only phones sold in the US that will work on LTE bands in the UK and Europe.
Sprint is not a good choice, because they give you a hard time if you want to unlock your phone.
AT&T phones are locked, but they will unlock the phone if you pay full price or pay off your early termination fee. However, they will only work on GSM in the UK, not on LTE (4G).

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