Hi. I just activated my wife's 4S. Everything went smoothly except that iMessage does not always work correctly. She can send an iMessage to me, both at my iPhone number and e-mail address. However, I cannot send her one at her iPhone number. I _am_ able to use her e-mail address, though. So the only problem seems to be that she can't receive an iMessage at her phone number. I checked the Messages settings to make sure iMessage is enabled. Her phone number shows up under "Receive At." Does it just take time for iMessage to be activated? Mine has been active for a while (since Beta) so I can't compare my settings with hers. TIA!