Currently Being ModeratedSep 30, 2012 5:50 PM (in response to JackieAppleseed)
Verizon has addresses the problem where cellular data is used even when a wifi connection exists:
This carrier settings update resolves an issue in which, under certain circumstances, iPhone 5 may use Verizon cellular data while the phone is connected to a Wi-Fi network. Follow these instructions to install the update.
Currently Being ModeratedOct 30, 2012 2:28 PM (in response to JackieAppleseed)
But those of us using iPhone 4 are screwed. 13.1 is a fix only for the 5.