Also, I was told by my cell company (can't remember if it was AT&T or Verizon at the time) that the cost was $1.50 per minute and it didn't matter if I made the call or I rec'd the call and also didn't matter if I answered it. Basically, if someone called my number and I didn't pick up, I'd still get charged $1.50/minute for them to listen to my outgoing message and leave me a voice mail (if my phone was turned on - if it's in airplane mode thats equivalent to the phone being turned off).

I've been putting it in airplane mode ever since and never had a problem. The only thing you can't do in airplane mode is text. I still e-mail using wifi and can still check voice mail messages using my JA phone so I'm good to go. I just tell all my friends who normally text me that they need to either send an e-mail or leave a voicemial while I'm gone.