You can enable an Add Network option. J100 phones will show this at the bottom of the list of available Wi-Fi networks list.
Using this option, you can connect a J100 phone to a Wi-Fi network that is not broadcasting its SSID. To enable the Add Network option, add SET ENABLE_HIDDEN_WIFI 1 to the 46xxspecials.txt file.
For example:
IF $MODEL4 SEQ J139 GOTO J1X9SPECIALS
IF $MODEL4 SEQ J169 GOTO J1X9SPECIALS
IF $MODEL4 SEQ J179 GOTO J1X9SPECIALS
IF $MODEL4 SEQ J159 GOTO J1X9SPECIALS
IF $MODEL4 SEQ J189 GOTO J1X9SPECIALS
GOT END
# J1X9SPECIALS
SET ENABLE_HIDDEN_WIFI 1
#END