Blackberry 8830 WORLD EDITION User Guide - Page 34

TTY support prerequisites • Verify that your wireless service provider supports this feature. • Verify that your TTY device operates at 45.45 bits per second. • Verify that you have inserted the TTY device connector into your BlackBerry® device headset jack. If you use an RJ-11 connector, you must use an adapter accessory to connect your TTY device to your BlackBerry device. Turn on TTY support 1. In the phone, press the Menu key. 2. Click Options. 3. Click TTY. 4. Set the TTY Mode field to Yes. 5. Press the Menu key. 6. Click Save. A TTY indicator appears in the device status section of the screen. To turn off TTY support, set the TTY Mode field to No. Multiple phone numbers About multiple phone numbers Your BlackBerry® device might support more than one phone number, or your device might be associated with a phone number provided by your wireless service provider and an enterprise voice phone number provided by your organization. If you have more than one phone number associated with your device, you can switch the phone number that you use as your active phone number. You make calls from and receive calls to your active phone number. During a call, you can use your active phone number only. For example, you cannot place one call on hold and make a second call using another phone number. Switch the active phone number Verify that your BlackBerry® device is connected to the wireless network. 1. In the phone options, click General Options. 2. Change the Active Line field. 3. Press the Menu key. 4. Click Save. 32