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A contact can be saved on a number key and dialled by pressing and holding the key it's saved on. Follow these instructions to make a call using speed dialling.
Before you can make a call using speed dialling, the contact must be saved on a key. Click here for information on how to assign a contact to a speed dialling key.
Furthermore, speed dialling needs to be turned on. Click here for information on how to turn on speed dialling.