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I really don't know and can't tell from here. You may have to keep fiddling with stty until communication with the modem is established. I don't even know if your modem responds quite like mine...

#!/bin/bash
modem=/dev/ttyUSB3
file=/home/giuseppe/Desktop/SCRIPTMODEM/imsi.txt

# print error to stderr and exit unsuccessfully
die() {
echo "$@" >&2
exit 1
}

# chat helper. try...

I don't think he means literally uploading a binary file. I think he just means putting the contents of a text file into the modem.

cat < file > /dev/ttyS3