Neck pain can be disquised as a headache. Have you ever been looking down at your phone too long and noticed your headaches got worse? That may be because of the way your head is positioned for long periods of time. Plus the light hitting your retinas could be causing your headaches as well.
Many people tend to get headaches because they are putting pounds of pressure on their necks and this pain is radiating up towards the person.
How can I get rid of the headaches and stop using my phone so much?
As far as getting rid of your headaches, you need heat applied to the area mixed with a neck/back massager. Or if you can afford it go for a massage session and say you have neck/headache pain from using your phone so much.