You can use IMAP from smartphones, and from Apple Mail. How to, per Wikipedia:

> Mac OS X users can directly set up an IMAP account in Apple Mail 4.4. After entering a full name, email address, and password, hold down the Option key. The Create button will change to Continue, allowing one to manually configure the account settings.

> Apple Mail 5.0 included with Mac OS X Lion supports easy and direct IMAP account setup.