Yealink SIP-T38G - Manual (Page 47)

Customizing Your Phone
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4. Click Upload Photo to upload the photo.
You can also click Delete Photo to delete the photo.
Note
When you place a call from the contact, the phone idle screen will show the contact
photo.
To place a call to a contact from the local directory:
1. Press Directory->Local Directory.
The phone only supports uploading the png, jpg or bmp format files. The maximum
resolution of the upload picture is 96*96 pixels.
You can only delete the custom photos.
If multiple contacts want to use the same custom photo, you need to upload the contact
photo again.