AT^SPOW for serial port sleep mode activation, default '2,1000,3' wakes up with CTS0/CTS1 There are also many other ways to reduce power consumption, like: What is the total power scenario in your application? How much is the BGS5 in the full communication mode? In terms of total power usage over time, the difference is not big. On the other hand, a higher GPRS class will use less time to send the same amount of data, so the power saving is locally ok for the modem but The network given coding scheme will also affect ther power consumption and speed (CS1 to CS4). The AT^SGCONF=x command will reduce power consumption but to my understanding, selection of Tx and Rx slots inside a class like '8', is not possible. The AT^SCFG='Radio/OutputPowerReduction' -command is '4' as delivered.