To add a contact on a Grandstream GRP2612 phone, you can follow these steps:
- Press the "Menu" button on your phone.
- Use the arrow keys to navigate to the "Directory" option and press "Select".
- Choose "Add Contact" and press "Select" again.
- Enter the name and phone number of the contact using the keypad on your phone.
- Press "Save" to save the contact.
You should now be able to find the contact in your phone's directory and call them directly by selecting their name from the list.