You can access your Gmail account from your mobile device using mobile web browsers. You need to follow below steps:
Just like you access your Gmail account on a computer, simply go to http://gmail.com in your mobile device's web browser to access Gmail. There's no setup required. The mobile browser interface of Gmail offers familiar features like archiving, labels, and lots of storage on our servers. Best of all, the mobile interface is always in sync with the main Gmail server.
To access Gmail account, your mobile devices should have Internet access enabled and should meet the below mentioned minimum requirements:
1. Your browser needs to be XHTML compliant. To determine whether your browser is compatible, visit http://www.google.com/xhtml and perform a search. If it doesn't work, your browser may not be XHTML compliant.
2. Your browser should have cookies enabled and your network should also allow cookies. The setting for cookies is usually located in your phone's browser settings. Contact your mobile service provider to determine if they allow cookies on their network.
3. Your network should allow secure SSL traffic. Contact your mobile provider to check this, too.
Source: Google