If your Cell2Jack's RED LED is solid on but get a warning message said "...phone is not connected", or You like to repair cell2jack to a new cell phone, do a Factory Reset. Factory Reset procedure: Enter 82#83# from your home phone keypad while your home phone is off hook. You should hear an acknowledge tone and an announcement "power on" .
After factory Reset done, reboot your Cell2Jack and re-pair (re-setup) Cell2Jack to your Cell Phone. If your cellphone has been paired to cell2jack previously, please un-pair cell2jack in your cellphone's Bluetooth setting first.