Looks like this is already sold out, however, it’s important to note the T-Mobile branded S6 (locked or unlocked), which this item may or may not be won’t work with Republic. The conundrum is there are multiple S6 variants designated model SM-G920T. One is the North American factory unlocked variant. Others are T-Mobile carrier branded variants. for this reason, Republic specifies specific software builds as follows:
For the Samsung Galaxy S6
Please note: The T-Mobile branded version of this phone is not compatible with our service.
The relevant document is here: Republic Wireless Phones.