Hello Guys, I told you that I am starting my own business as my school announcement, so I wanted to share some details about it. It would be very small because some modern smartphones have very small space, and their measurements would be in mm.
As I am about to tell you about my app, it would be similar to find my device.
The components are as follows:

• ESP32-PICO-D4
• SIM868
• Li-Po battery
• PCB
• Capacitors
• Resistors
• Connectors
• Antennas

Until then I will then update you on my progress and you can suggest me about where to buy these