Should I disconnect the wireless session when I dont want my device to actively check for email?
Yes. Many PDAs/Smartphones feature an always-on (or dormant) mode that enables the device to actively check for email. Therefore, you should disconnect your wireless session when you do not want your email actively checked, especially if you are not on unlimited price plans. Doing so will help you avoid additional charges due to dormant, yet active and billable, data sessions.