Is it possible to change your cdma iphone 5 to a gsm carrier, and then back to your previous cdma carrier?

I'm using StraightTalk right now and am wanting to try out H20. I know my iphone 5 is gsm unlocked so the switch to the gsm H20 Network should be simple enough. I'm wondering though if for some reason I don't find H20 a good option can I switch back to StraightTalk on my CDMA network.

If you have a CDMA iPhone 5 (in the USA, model A1429), and the GSM slot is truly unlocked (not just unlocked for international use) then you can use it with a GSM network.  You should be able to go back to the same CDMA network it was sold for - in other words, you cannot change to a different CDMA carrier as the CDMA carrier is permanently locked in firmware and cannot be altered.
But make sure the GSM SIM slot is truly unlocked.  For example a USA Sprint iPhone 5 could have the GSM SIM slot unlocked for international use, but it would not accept a SIM card for any GSM carrier in the USA, only for overseas carriers.  I'm not sure what Verizon's policy was with iPhone 5 phones (with the new iPhone 5s or 5c, Verizon phones are sold with no lock of any kind on the GSM SIM slot).

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