Two questions: (1)does a slightly high blood pressure be a trigger for migraine? (2) looking into mobile phone for 6 hours a day trigger a migraine?

I think. That the two factors are tied together. The blood pressure is due to lack of balance in the autonomic (automatic) nervous system and the mobile phone just adds more "stress". If your metabolism in brain is marginal, a stress factor may "kick it over the edge". See my post on "diet". It might be the "glue" that makes them come together. Is the phone essential for your work?.