Password Protect for Andorid mobile I lost my android mobile, but I haven't logged out of gmail account, since using the device, I must log on. So if someone take it, he/she may access my gmail account. What should I do now?
Log-in to your gmail account. Change your password first. Then, on the page where you see mails, down in the bottom, Click on the link "Details" in the right bottom corner. Click on "Sign-out all other sessions". You will sign-out of all the sessions. It will be effective on logged-in mobile once user tries to do any action on your gmail.

Hope it helps...