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i am using arduino uno and sim808. i connected the sim808 to pins 2,3 on arduino uno and used GSM library. i tested all examples: make and receive a call or messages. the part of GPRS initialization is not working after many tries in changing APN and pin number. i want to use the arduino as a webserver exactly as the example includded in the library. any one can help? thanks, https://www.arduino.cc/en/Reference/GSM

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I had the same problem I solved it by moving the jumper wires on the shield(if you are using one) to SW serial. if that doesn't work try testing it with AT commands

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