Inclusion Criteria:  Participants were 55 years and above, have follow-up with out-patients of KAUH, had been diagnosed with hypertension, on anti-hypertension medication- at least one drug, reported that he/she has a personal smartphone (Android) - internet access is not important, able to read and understand the Arabic language.  Exclusion Criteria:  Participants have Apple phones, had any psychiatric or mental illness, had a terminal-stage disease or were blind or deaf.