Mohamed-Atef:
My GSM Work On (115200 ) Must >>> in his datasheet !! if i change it will not work so i need software serial For him So ?! how can i resolve this problem !!
thnx
Either get a Mega, Leonardo or Micro which have extra HardwareSerial ports
OR
Use HardwareSerial (pins 0 an 1) on your Uno for the GSM device and get a USB-TTL so you can communicate with your PC at 9600 baud using SoftwareSerial. You will probably need to disconnect the GSM device to upload programs
...R