HP Compaq Presario,Presario 1515 Supplementary Manual page 25

Cradling your phone between your ear and shoulder may lead to neck, shoulder, and
back discomfort. If you use your phone a lot, try using a headset or positioning your
phone so you pick it up with your non-dominant hand. This frees your dominant hand
for note-taking. When not in use, place the phone within easy reach.
Use a headset to free your hands and help you avoid
uncomfortable positions.
Don't cradle your phone between your ear and shoulder.