I had JuiceDefender with the basic settings enabled since the day I got my phone. Quite often, I would experience issues like failed incoming/outgoing text messages and calls. When making calls, the phone would just say "Dialing" and make some clicking noises and automatically disconnect. I would get errors sending texts, and get incoming texts late, or not even at all. I removed JuiceDefender off my phone the other day and since then I haven't once had any of these issues. I think the issue lies with JuiceDefender turning off the 3G antenna when the phone's in standby, and starting it up again when out of standby (sometimes fails to do this altogether and a restart is needed). I just wanted to let others know that if they have JuiceDefender or similar battery saving programs, and are experiencing problems like I had, these programs may be the culprit.