Gmail has added IMAP access. It does not show up in all the accounts, but it will be rolled out to all accounts in the next few days.
https://mail.google.com/support/bin/topic.py?topic=12760
You can configure IMAP on your iPhone too.
https://mail.google.com/support/bin/answer.py?answer=77702&topic=12761
Anyway there is also a URL for mobile phones which is almost like the web interface.
http://m.gmail.com
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