Will a 3G unlocked S7 work with straight talk?

That would depend on what network (what service provider/carrier) the phone was on originally. If it wasn't on one, which would be kind of rare, then you would need to know if the phone is CDMA or GSM. They are not interchangeable and phones cannot be changed from one to the other.

GSM Carriers in the US... http://www.tomsguide.com/faq/id-3143113/gsm-carriers-usa.html

CDMA Carriers in the US... http://www.tomsguide.com/faq/id-3143114/cdma-carriers-usa.html

Straight Talk uses CDMA in some areas and GSM in others. As an example of how that can be... they could be using Sprint's network in this state, but AT&T's network in another state. This means that once you know what the phone is (CDMA or GSM) then you would need to check with Straight Talk to find out which one is used in your area.
 
That would depend on what network (what service provider/carrier) the phone was on originally. If it wasn't on one, which would be kind of rare, then you would need to know if the phone is CDMA or GSM. They are not interchangeable and phones cannot be changed from one to the other.

GSM Carriers in the US... http://www.tomsguide.com/faq/id-3143113/gsm-carriers-usa.html

CDMA Carriers in the US... http://www.tomsguide.com/faq/id-3143114/cdma-carriers-usa.html

Straight Talk uses CDMA in some areas and GSM in others. As an example of how that can be... they could be using Sprint's network in this state, but AT&T's network in another state. This means that once you know what the phone is (CDMA or GSM) then you would need to check with Straight Talk to find out which one is used in your area.
 
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