Five steps from a problem to its solution.

Help me design and build a first working prototype for this problem in Simdega, Jharkhand, India.

Problem: Villagers in Jharkhand's Simdega district have no mobile signal, and no clear way to show officials exactly where coverage stops.
Who it hurts: People in hilly villages of Simdega, such as Barki Chhapar, that sit outside the range of the nearest mobile tower.
The moment it hurts: Needing to call for help at night, or to receive an urgent message, and having to walk towards a spot that gets some signal.
What people do today: Residents and panchayat leaders write letters to the district administration, which raises the issue with the Central government and the area's MP.
Why it is still unsolved: Coverage maps show the tower, not the villages its signal fails to reach, so gaps are invisible until someone famous complains, and the fix depends on BSNL and Central funding.
What solved looks like: A shared dead-zone map for Simdega built from simple reports and offline signal readings collected by villagers, showing each village's coverage, nearest working spot and offered tower land, that the district's network committee can take to Digital Bharat Nidhi and BSNL.
Where: Simdega, Jharkhand, India

First, list what you would need to learn from the people affected before building, as interview questions.
Then propose the simplest version that would help, the screens or messages it needs, and the data it would use.
Keep it cheap to run, accessible, and respectful of people's privacy. Flag anything you are unsure about instead of guessing.