bkil vs. programming

I've just realized that stock Android 2.1 on the U20i (so called "mimmi") discovers Wifi networks by  passive scanning , and only sends out a few probe requests as an acceleration in case of opening the network list menu after waking up. On the other hand, it seems that both Pulse mini (Huawei U8110 with Android 2.1) and Mango (Xperia mini pro SK17i with Android 4.0.4) use normal active scanning. Common wisdom tells you that passive scanning potentially uses more power. This can happen because the receiver's low noise amplifier and processor can use as much power as the transmit circuit. This is especially plausible because maximum transmit power usually shouldn't exceed 100mW anyway (actually 20dBm EIRP ) which is in the ball park of the wireless chip's total consumption already, let alone the whole chipset or mobile device. Active probing involves sending out a probe request on each channel and listening for a response for a limited short interval. I guess...

It works out of the box with a plain wvdial after a small adjustment (need to erase the +FCLASS=0 part). It is detected as the following device (after the automatic mode switch): ID 12d1:1506 Huawei Technologies Co., Ltd. E398 LTE/UMTS/GSM Modem/Networkcard For the record, I paste the wvdial.conf configured for T-Mobile in Hungary: [Dialer Defaults] Init1 = ATZ Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 Init3 = AT+CGDCONT=1,"IP","internet" Modem = /dev/ttyUSB0 Username = wap Password = wap Modem Type = Analog Modem Baud = 9600 New PPPD = yes ISDN = 0 Phone = *99# Stupid Mode = 1 Most of the settings are not crucial, but some of them depend on your carrier, like "Init3", "Username" and "Password", while "Modem" depends on your device.