Model G920?
What model ?
G920A
G920F
G920I
G920P
G920T
From GSM Arena:
SM-G9200 (Hong Kong)
SM-G9208 (China)
SM-G9208/SS (China)
SM-G9209 (China)
SM-G920A (AT&T)
SM-G920F (Global)
SM-G920FD (Pakistan, Philippines)
SM-G920I (LATAM, Singapore, India, Australia)
SM-G920S (Korea)
SM-G920T (T-Mobile)
And the CDMA Galaxy S6:
SM-G920P (Sprint)
SM-G920V (Verizon)
SM-G920R (U.S. Cellular)
SM-G920W8 (Canada)
Some models have different bands, you can view the differences by clicking EXPAND caret under the NETWORK heading for each technology type on the specific pages linked here: for GSM <http://m.gsmarena.com/samsung_galaxy_s6-6849.php> and for CDMA <http://m.gsmarena.com/samsung_galaxy_s6_(cdma)-7164.php>