There may be a menu entry in the phone for assigning a number for forwarding. You have to use GSM codes for call forwarding if there is no menu item. The item you used is for landlines. Use "Divert All Calls" instructions from this URL: http://www.cellular.co.za/gsm_hash_code.htm Make sure that you forward to a number for which you can retrieve messages. The best choice is your Voicemail Deposit Number. Dial "*#61#" and Call to see what the number is and then enter that number in this short code "**21*DestinationNumber#" and Call.