This slide shows how the weight on the neck spine is inflicted in relation to the degree of bending of neck in using mobile phones.More the bending forward, greater the grade of weight on neck , burdening it. Heavy usage of mobile phones has its own share of challenges if the neck posture is NOT taken care of .
In the long run over a span of few months the anatomical structures of the neck and shoulder start getting wear and tear and chronic neck issues develop
Upright posture of neck and watching mobile at eyes level helps good health of spine.