I have done lots of research on this, and Im confused at what to do. This is my first android phone, im trying to figure it out. I have had sprint for a few months, and coverage inside my house is terrible. Dropped calls, late texts, slow internet on my Blackberry Tour. I got the Evo, so that i could use WiFi. But, im concerned that the low signal is killing my battery. Its been a lot worse, but at the moment im at 37% Time without signal. Ive researched and found a few things: 1- I dialed *#*#4636#*#* and switched to CDMA Auto Prl 2- Also, I use WiFi while at home, but i cant turn on airplane mode, because i need to answer some calls and some texts. However, leaving airplane mode off, im concerned it will kill the battery faster while its searching for signal. Im thinking of calling sprint and asking for the 'Airrave'. Would that fix the time with out signal, give me better reception, and save the battery?