AT#TXCAL4G?
Read command returns the bands supported and the maximum power
level set for each band in the format:
#TXCAL4G: <band>,<txPwrLev>
#TXCAL4G: <band>,<txPwrLev>
#TXCAL4G: <band>,<txPwrLev>
#TXCAL4G: <band>,<txPwrLev>
#TXCAL4G: <band>,<txPwrLev>
...