Not all.. if you want your app to work internationally then use all quad-band frequencies. 850-900-1800-1900
What do you want to achieve? Depending on your project you may need to know the cellular communication protocol built into the SIM900 chip.
Not all.. if you want your app to work internationally then use all quad-band frequencies. 850-900-1800-1900
What do you want to achieve? Depending on your project you may need to know the cellular communication protocol built into the SIM900 chip.
For that I love computer science
There is always a way out.
must do a communication protocol with a microcontroller from Texas the instruments CC430F5133 http://www.ti.com/lit/ds/symlink/cc430f5137.pdf