SIM300 and REB-1315s4. How can I interface both with Arduino Uno

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I have a problem in interfacing both SIM300 and REB-1315s4 with Arduino Uno.

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aman69:
I have a problem in interfacing both SIM300 and REB-1315s4 with Arduino Uno.

Sorry to hear that.

If you want anyone to do anything about it you will have to say what the problem actually is. Also links to the data sheets of the two devices would make helping you easier.