Spark’s initial 5G deployment is ‘NSA’ (non-stand-alone). What this means is that a device first needs to connect to 4G before it can connect to 5G. This means that at minimum, a device must support both LTE 2100MHz (B1) and 5G (N78).
Spark supports the following 4G/LTE operating frequencies
LTE 2100MGz (B1)
LTE 700MGz (B28)
LTE 1800MGz (B3)
LTE 2300 MHz (B40)
LTE 2600MHz (B7)
Spark supports the following 3G operating frequencies