Go to your Google Account. On the left navigation panel, select Security . On the Your devices panel, select Manage all devices. You'll see devices where you're currently signed in to your Google Account or have been in the last few weeks.

Make sure the browser works with Gmail. Browsers such as Chrome, Firefox, and Safari work well with Gmail, but some browsers don't. If you have problems and you know the browser is compatible, enable cookies and JavaScript. Use another browser or device.

Google allows its users to set up an unlimited number of Gmail addresses. You can manage all of your Gmail addresses in one place through your Google account, which makes it easy to stay organized. There is a caveat though: You'll be limited to four total Gmail accounts linked to the same phone number.