BlackBerry 10
Important First Notes:
Blackberry Enterprise Server will be depreciated starting on March 5, 2015. This means that BlackBerry devices older than the BlackBerry 10 that do not have ActiveSync on them will not be supported with Google Apps.
You can still use your BlackBerry's browser to access Google Apps just as you would on your PC or Mac browser by opening your BlackBerry browser, go to m.google.com, and select the app you wish to access.
For additional information on this and more, please look below the BlackBerry 10 setup instructions.
Getting Started with Google Sync on BlackBerry 10 Devices
Google Sync allows you to sync mail, calendar, and contacts from your Google Apps account to your BlackBerry 10 device. Before setting up Google Sync, back up your BlackBerry data to your computer following the instructions in BlackBerry’s Knowledge Base
Set up Google Sync
Open the Settings application on your device's home screen
Open Accounts
Select Add Account
Scroll down and open Advanced
Select Microsoft Exchange ActiveSync
In the Email field, enter your full Google Account email address
Leave the Domain field blank
Enter your full Google Account email address as the Username
Enter your Google Account password as the password
Enter m.google.com as the server address
Press Next at the top of your screen again and select which services you would like to sync
You've set up Google Sync! Synchronization will begin automatically if you have Push enabled on your device. You can also open the Mail, Calendar, or Contacts app and wait a few seconds to start a sync. Note that if you've recently signed up for Google Apps for Work, Education, or Government, it can take a few hours (up to 24) before you're able to sync with your mobile device.
The following information applies to non-Blackberry 10 devices that need to access Google Apps. For more information, please see the following support article for details:
https://support.google.com/a/users/answer/2365095?hl=en
BlackBerry Browser
You can use any smartphone to access Gmail, Calendar, Google Docs and a host of other Google Apps, all from the phone's mobile browser. There, you'll have much the same experience as when using apps on a computer's web browser.
Launch your phone's mobile browser, and go to m.google.com.
Touch the app you want to use to open its launch screen. Launch the app, and if prompted, sign in to your Google Apps account by entering your email address and password.