The SIM800L GSM Modem with External Antenna is a cheap, modern and full-featured GSM modem.
SIM800L GSM modem with external antenna
| Dimensions | 2.2 × 1.8 × 1 cm |
|---|---|
| Feature 1 | Quad-band GSM 850/900/1800/1900 MHz |
| Feature 2 | Interface – UART (Rx, Tx, Gnd) |
| Feature 3 | Micro SIM card |
| Supply voltage | 3.5 – 4.5 V |
| Operating temperature range | -30 °C-+80 °C |
| Control | AT commands |








This type of modem is used in some modern smartphones. The L index indicates that the modem can operate in low power mode. To connect the SIM800L to the Arduino you will need a silicon diode with at least 500 mA and a 100 uF x 10 V electrolytic capacitor or a buck power converter with at least 1000 mA


















