Improving Hypertension Control in CHina and ARGEntina With a Mobile APP-based Telecare System

This study is testing whether a smartphone app designed to help patients monitor and manage their blood pressure — combined with guidance from healthcare providers — can improve blood pressure control better than standard care alone, for people with uncontrolled high blood pressure in China and Argentina. **You may be eligible if...** - You are between 18 and 80 years old - You have uncontrolled high blood pressure (whether on medication or not), confirmed by both office and 24-hour blood pressure monitoring - You or someone close to you owns a compatible smartphone and can use the app **You may NOT be eligible if...** - Your kidney function is significantly reduced - You have extremely high blood pressure (above 200/120 mmHg despite treatment) - You have high blood pressure caused by another medical condition (secondary hypertension) - You have low blood pressure when standing up (orthostatic hypotension) - You have unstable heart disease, a recent stroke, or another serious medical condition Talk to your doctor to see if this trial is right for you.