For BlackBerry 10 devices: If you are using a BlackBerry 10 device, you can activate your device on a BES 10 server using any data plan.
For BlackBerry 7 device and before: Before we assist you with activating your Blackberry on the Blackberry Exchange Server, we must first determine if the your current data plan is set up for Enterprise Activation.
The most commonly advertised data plans for email, SMS, BBM, and text are set up for using BIS or Blackberry Internet Service ( used for personal email accounts like hotmail / gmail / yahoo etc. ), NOT for using BES ( Blackberry Enterprise Server ).
We can test if your current data plan is provisioned correctly for BES, to do so we will need the ESN or IMEI and the PIN number. Use the steps provided to access this information.
1. Depending on what Theme you have chosen for your device ( how the icons are set up on the home screen ), you may need to go to the Applications icon and press the track ball or the scroll wheel to select.

2. Scroll to the Options icon ( the wrench icon ) and press the track ball or the scroll wheel to select.

3. Scroll sown the list to the "Status" option and press the track ball or the scroll wheel to select.

4. The required Information is located on this screen. Depending on your Carriers network, CDMA, or GSM, your device will have either an ESN or an IMEI number.

If your device has an ESN number then write down both the (dec) and (hex) numbers provided along with the PIN number.

Once you have this information, contact customer support. We will then do the test to determine if your device is provisioned correctly and assist you with the additional steps for Enterprise activations. For further information on Enterprise Activations click here: How do I activate my Blackberry on a BES?
If the test determines that your current data plan does not allow for Enterprise activations, these are questions you must ask your Carrier:
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Does your Carrier have data plans that will allow them activate the device on a BES or Blackberry Enterprise Server?
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Can my device be provisioned for use with a BES?
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If so what are the costs involved?
NOTE - A brief discussion with the Carrier will be required regarding email use, estimated amount of email, attachments type and size, and other data requirements you may have. All of these have to be taken into consideration when choosing the BES enabled data plan best suited to your needs. Some carriers will charge by the MB or KB for overages in data use for BES enabled data plans and as such can be very expensive when your monthly quota is exceeded - best to overestimate usage, or inquire about flex plans which meter your usage and bump you up to the next plan bracket if your data consumption is exceeded and vice versa for months of low usage.
Contact customer support for assistance relaying these questions to your Carrier.
Please note that you can get most of the functionality of a BlackBerry Enterprise Server with BlackBerry Enterprise Server Express. Howerver, BlackBerry will only be supporting BESExpress until 2015, and it is only available to BlackBerry 7 and earlier devices. There is no BESExpress for BlackBerry 10 devices.