The phone

So… I’ve built an actual cellphone. I’t based on the humble ESP32 and the SIM800 modem. The software could receive some more features than just making and receiving calls and SMS messages, but let’s call it finished for now.

The killer features of this crazy device are:

• GSM (2G) cellular network
• SD card slot
• 128x64 OLED display
• a 4x3 keypad
• volume and power buttons
• huge antenna which is actually from a WiFi router but it works wonderfully :)
• audio recording and playback
• 4000mAh battery