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The power supply range of SIM300 is from 3.4V to 4.5V. The transmitting burst will cause voltage drop and the
power supply must be able to provide sufficient current up to 2A. For the VBAT input, a bypass capacitor (low
ESR) such as a 100 μF is strongly recommended; this capacitor should be...
Hi fiends ,
I have made GSM modul with SIM900d and PIC16F870 .
I make voice call and it work only if the gsm number is in code .
But i want SIM900 to take number from sim card . I have write number in sim phone book in first position.
For this i send via UART AT command :
AT+CPBS="SM"
ATD>SM1...
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