Does a US GSM cell phone work with a GSM (4G) from south america?

[seba_carne]

Does a US GSM cell phone work with a GSM (4G) from south america?

 

[Petrossa]

If the phone is GSM and the network is GSM, there should be no problem so long as the phone supports the frequency of the network it is going to be used on and it is not locked to the US network it is coming from.